diff --git a/source/core/coreactor.h b/source/core/coreactor.h
index 27505d6f5..17e1bee79 100644
--- a/source/core/coreactor.h
+++ b/source/core/coreactor.h
@@ -111,6 +111,11 @@ public:
 		spr.angle = spr.angle.Normalized360();
 	}
 
+	int int_zvel() const
+	{
+		return spr. zvel;
+	}
+
 	// Same as above but with inverted y and z axes to match the renderer's coordinate system.
 
 	double interpolatedx(double const smoothratio, int const scale = 16)
diff --git a/source/core/gamefuncs.cpp b/source/core/gamefuncs.cpp
index 9c289ff83..b886d6c92 100644
--- a/source/core/gamefuncs.cpp
+++ b/source/core/gamefuncs.cpp
@@ -615,7 +615,7 @@ tspritetype* renderAddTsprite(tspriteArray& tsprites, DCoreActor* actor)
 	tspr->angle = actor->spr.angle;
 	tspr->xvel = actor->spr.xvel;
 	tspr->yvel = actor->spr.yvel;
-	tspr->zvel = actor->spr.zvel;
+	tspr->zvel = actor->int_zvel();
 	tspr->lotag = actor->spr.lotag;
 	tspr->hitag = actor->spr.hitag;
 	tspr->extra = actor->spr.extra;
diff --git a/source/games/duke/src/actors.cpp b/source/games/duke/src/actors.cpp
index ab88a9a1d..99e76f460 100644
--- a/source/games/duke/src/actors.cpp
+++ b/source/games/duke/src/actors.cpp
@@ -226,7 +226,7 @@ int ssp(DDukeActor* const actor, unsigned int cliptype) //The set sprite functio
 
 	return movesprite_ex(actor,
 		MulScale(actor->spr.xvel, bcos(actor->int_ang()), 14),
-		MulScale(actor->spr.xvel, bsin(actor->int_ang()), 14), actor->spr.zvel,
+		MulScale(actor->spr.xvel, bsin(actor->int_ang()), 14), actor->int_zvel(),
 		cliptype, c) == kHitNone;
 }
 
@@ -1259,7 +1259,7 @@ void bounce(DDukeActor* actor)
 {
 	int xvect = MulScale(actor->spr.xvel, bcos(actor->int_ang()), 10);
 	int yvect = MulScale(actor->spr.xvel, bsin(actor->int_ang()), 10);
-	int zvect = actor->spr.zvel;
+	int zvect = actor->int_zvel();
 
 	auto sectp = actor->sector();
 
@@ -4192,7 +4192,7 @@ void handle_se21(DDukeActor* actor)
 
 	if (sc->extra == 0)
 	{
-		lp += actor->spr.zvel;
+		lp += actor->int_zvel();
 
 		if (abs(lp - actor->int_pos().Z) < 1024)
 		{
diff --git a/source/games/duke/src/actors_d.cpp b/source/games/duke/src/actors_d.cpp
index 89265a4f1..e3ec3bdd2 100644
--- a/source/games/duke/src/actors_d.cpp
+++ b/source/games/duke/src/actors_d.cpp
@@ -1315,7 +1315,7 @@ static bool movefireball(DDukeActor* actor)
 
 				ball->spr.xvel = actor->spr.xvel;
 				ball->spr.yvel = actor->spr.yvel;
-				ball->spr.zvel = actor->spr.zvel;
+				ball->spr.zvel = actor->int_zvel();
 				if (actor->temp_data[0] > 1)
 				{
 					if (trail)
@@ -1517,7 +1517,7 @@ static void weaponcommon_d(DDukeActor* proj)
 	else
 	{
 		k = proj->spr.xvel;
-		ll = proj->spr.zvel;
+		ll = proj->int_zvel();
 	}
 
 	getglobalz(proj);
@@ -2476,7 +2476,7 @@ static void flamethrowerflame(DDukeActor *actor)
 
 	Collision coll;
 	movesprite_ex(actor, MulScale(xvel, bcos(actor->int_ang()), 14),
-		MulScale(xvel, bsin(actor->int_ang()), 14), actor->spr.zvel, CLIPMASK1, coll);
+		MulScale(xvel, bsin(actor->int_ang()), 14), actor->int_zvel(), CLIPMASK1, coll);
 
 	if (!actor->insector())
 	{
@@ -2599,7 +2599,7 @@ static void heavyhbomb(DDukeActor *actor)
 	movesprite_ex(actor,
 		MulScale(actor->spr.xvel, bcos(actor->int_ang()), 14),
 		MulScale(actor->spr.xvel, bsin(actor->int_ang()), 14),
-		actor->spr.zvel, CLIPMASK0, coll);
+		actor->int_zvel(), CLIPMASK0, coll);
 
 	if (actor->sector()->lotag == 1 && actor->spr.zvel == 0)
 	{
@@ -3671,7 +3671,7 @@ void move_d(DDukeActor *actor, int playernum, int xvel)
 		Collision coll;
 		actor->movflag = movesprite_ex(actor,
 			MulScale(daxvel, bcos(angdif), 14),
-			MulScale(daxvel, bsin(angdif), 14), actor->spr.zvel, CLIPMASK0, coll);
+			MulScale(daxvel, bsin(angdif), 14), actor->int_zvel(), CLIPMASK0, coll);
 	}
 
 	if (a)
diff --git a/source/games/duke/src/actors_r.cpp b/source/games/duke/src/actors_r.cpp
index 7925445e0..2e7d38c85 100644
--- a/source/games/duke/src/actors_r.cpp
+++ b/source/games/duke/src/actors_r.cpp
@@ -1188,7 +1188,7 @@ static void weaponcommon_r(DDukeActor *proj)
 	else
 	{
 		k = proj->spr.xvel;
-		ll = proj->spr.zvel;
+		ll = proj->int_zvel();
 	}
 
 	auto oldpos = proj->spr.pos;
@@ -2377,7 +2377,7 @@ static void heavyhbomb(DDukeActor *actor)
 	movesprite_ex(actor,
 		MulScale(actor->spr.xvel, bcos(actor->int_ang()), 14),
 		MulScale(actor->spr.xvel, bsin(actor->int_ang()), 14),
-		actor->spr.zvel, CLIPMASK0, coll);
+		actor->int_zvel(), CLIPMASK0, coll);
 
 	if (actor->sector()->lotag == 1 && actor->spr.zvel == 0)
 	{
@@ -2565,7 +2565,7 @@ static int henstand(DDukeActor *actor)
 		movesprite_ex(actor,
 			MulScale(bcos(actor->int_ang()), actor->spr.xvel, 14),
 			MulScale(bsin(actor->int_ang()), actor->spr.xvel, 14),
-			actor->spr.zvel, CLIPMASK0, coll);
+			actor->int_zvel(), CLIPMASK0, coll);
 		if (coll.type)
 		{
 			if (coll.type == kHitWall)
@@ -2681,7 +2681,7 @@ void moveactors_r(void)
 				movesprite_ex(act,
 					MulScale(act->spr.xvel, bcos(act->int_ang()), 14),
 					MulScale(act->spr.xvel, bsin(act->int_ang()), 14),
-					act->spr.zvel,CLIPMASK0, coll);
+					act->int_zvel(),CLIPMASK0, coll);
 				switch (sectp->lotag)
 				{
 					case 901:
@@ -2722,7 +2722,7 @@ void moveactors_r(void)
 				movesprite_ex(act,
 					MulScale(act->spr.xvel, bcos(act->int_ang()), 14),
 					MulScale(act->spr.xvel, bsin(act->int_ang()), 14),
-					act->spr.zvel,CLIPMASK0, coll);
+					act->int_zvel(),CLIPMASK0, coll);
 				if (coll.type > kHitSector)
 				{
 					deletesprite(act);
@@ -2753,7 +2753,7 @@ void moveactors_r(void)
 				movesprite_ex(act,
 					MulScale(act->spr.xvel, bcos(act->int_ang()), 14),
 					MulScale(act->spr.xvel, bsin(act->int_ang()), 14),
-					act->spr.zvel,CLIPMASK0, coll);
+					act->int_zvel(),CLIPMASK0, coll);
 				if (act->spr.pos.Z >= sectp->floorz - 8)
 				{
 					if (sectp->lotag == 1)
@@ -2852,7 +2852,7 @@ void moveactors_r(void)
 						movesprite_ex(act,
 							MulScale(act->spr.xvel, bcos(act->int_ang()), 14),
 							MulScale(act->spr.xvel, bsin(act->int_ang()), 14),
-							act->spr.zvel,CLIPMASK0, coll);
+							act->int_zvel(),CLIPMASK0, coll);
 						act->spr.xvel--;
 					}
 				break;
@@ -3744,7 +3744,7 @@ void move_r(DDukeActor *actor, int pnum, int xvel)
 		Collision coll;
 		actor->movflag = movesprite_ex(actor,
 			MulScale(daxvel, bcos(angdif), 14),
-			MulScale(daxvel, bsin(angdif), 14), actor->spr.zvel, CLIPMASK0, coll);
+			MulScale(daxvel, bsin(angdif), 14), actor->int_zvel(), CLIPMASK0, coll);
 	}
 
 	if (a)
diff --git a/source/games/duke/src/gameexec.cpp b/source/games/duke/src/gameexec.cpp
index 5e2aa45e8..d3d4c7f7f 100644
--- a/source/games/duke/src/gameexec.cpp
+++ b/source/games/duke/src/gameexec.cpp
@@ -1246,7 +1246,7 @@ void DoActor(bool bSet, int lVar1, int lLabelID, int lVar2, DDukeActor* sActor,
 		break;
 	case ACTOR_ZVEL:
 		if (bSet) act->spr.zvel = lValue;
-		else SetGameVarID(lVar2, act->spr.zvel, sActor, sPlayer);
+		else SetGameVarID(lVar2, act->int_zvel(), sActor, sPlayer);
 		break;
 	case ACTOR_LOTAG:
 		if (bSet) act->spr.lotag = lValue;
@@ -1969,11 +1969,11 @@ int ParseState::parse(void)
 		break;
 	case concmd_strafeleft:
 		insptr++;
-		movesprite_ex(g_ac, -bsin(g_ac->int_ang(), -10), bcos(g_ac->int_ang(), -10), g_ac->spr.zvel, CLIPMASK0, coll);
+		movesprite_ex(g_ac, -bsin(g_ac->int_ang(), -10), bcos(g_ac->int_ang(), -10), g_ac->int_zvel(), CLIPMASK0, coll);
 		break;
 	case concmd_straferight:
 		insptr++;
-		movesprite_ex(g_ac, bsin(g_ac->int_ang(), -10), -bcos(g_ac->int_ang(), -10), g_ac->spr.zvel, CLIPMASK0, coll);
+		movesprite_ex(g_ac, bsin(g_ac->int_ang(), -10), -bcos(g_ac->int_ang(), -10), g_ac->int_zvel(), CLIPMASK0, coll);
 		break;
 	case concmd_larrybird:
 		insptr++;
diff --git a/source/games/duke/src/player_r.cpp b/source/games/duke/src/player_r.cpp
index f283edf12..df92b1d1a 100644
--- a/source/games/duke/src/player_r.cpp
+++ b/source/games/duke/src/player_r.cpp
@@ -2473,7 +2473,7 @@ void onMotorcycleHit(int snum, DDukeActor* victim)
 			{
 				Collision coll;
 				int ang = int(p->TiltStatus * 20 + p->angle.ang.Buildang());
-				movesprite_ex(victim, bcos(ang, -8), bsin(ang, -8), victim->spr.zvel, CLIPMASK0, coll);
+				movesprite_ex(victim, bcos(ang, -8), bsin(ang, -8), victim->int_zvel(), CLIPMASK0, coll);
 			}
 		}
 		else
@@ -2533,7 +2533,7 @@ void onBoatHit(int snum, DDukeActor* victim)
 			{
 				Collision coll;
 				int ang = int(p->TiltStatus * 20 + p->angle.ang.Buildang());
-				movesprite_ex(victim, bcos(ang, -9), bsin(ang, -9), victim->spr.zvel, CLIPMASK0, coll);
+				movesprite_ex(victim, bcos(ang, -9), bsin(ang, -9), victim->int_zvel(), CLIPMASK0, coll);
 			}
 		}
 		else
diff --git a/source/games/exhumed/src/fish.cpp b/source/games/exhumed/src/fish.cpp
index 263cdd0e3..b0a492362 100644
--- a/source/games/exhumed/src/fish.cpp
+++ b/source/games/exhumed/src/fish.cpp
@@ -119,7 +119,7 @@ void AIFishLimb::Tick(RunListEvent* ev)
     }
     else
     {
-        auto coll = movesprite(pActor, pActor->spr.xvel << 8, pActor->spr.yvel << 8, pActor->spr.zvel, 2560, -2560, CLIPMASK1);
+        auto coll = movesprite(pActor, pActor->spr.xvel << 8, pActor->spr.yvel << 8, pActor->int_zvel(), 2560, -2560, CLIPMASK1);
         if (coll.type != kHitNone)
         {
             pActor->spr.xvel = 0;
@@ -198,12 +198,12 @@ void IdleFish(DExhumedActor* pActor, int edx)
     if (!edx)
     {
         if (RandomBit()) {
-            pActor->spr.zvel = -pActor->spr.zvel;
+            pActor->spr.zvel = -pActor->int_zvel();
         }
     }
     else if (edx < 0)
     {
-        pActor->spr.zvel = -pActor->spr.zvel;
+        pActor->spr.zvel = -pActor->int_zvel();
     }
 }
 
diff --git a/source/games/exhumed/src/grenade.cpp b/source/games/exhumed/src/grenade.cpp
index 1dad355ad..3a7db2432 100644
--- a/source/games/exhumed/src/grenade.cpp
+++ b/source/games/exhumed/src/grenade.cpp
@@ -85,7 +85,7 @@ void ThrowGrenade(int nPlayer, int, int, int ecx, int push1)
     else
     {
         pActor->nTurn = 0;
-        pActor->spr.zvel = pPlayerActor->spr.zvel;
+        pActor->spr.zvel = pPlayerActor->int_zvel();
     }
 
     pActor->x = bcos(nAngle, -4) * pActor->nTurn;
@@ -277,10 +277,10 @@ void AIGrenade::Tick(RunListEvent* ev)
             return;
         }
 
-        int zVel = pActor->spr.zvel;
+        int zVel = pActor->int_zvel();
 
         Gravity(pActor);
-        auto nMov = movesprite(pActor, pActor->x, pActor->y, pActor->spr.zvel, pActor->spr.clipdist >> 1, pActor->spr.clipdist >> 1, CLIPMASK1);
+        auto nMov = movesprite(pActor, pActor->x, pActor->y, pActor->int_zvel(), pActor->spr.clipdist >> 1, pActor->spr.clipdist >> 1, CLIPMASK1);
 
         if (!nMov.type && !nMov.exbits)
             return;
diff --git a/source/games/exhumed/src/items.cpp b/source/games/exhumed/src/items.cpp
index 239d88055..db5fee32f 100644
--- a/source/games/exhumed/src/items.cpp
+++ b/source/games/exhumed/src/items.cpp
@@ -420,8 +420,8 @@ void DoRegenerates()
         pActor->spr.yrepeat = (uint8_t)pActor->spr.xvel;
         pActor->spr.xrepeat = (uint8_t)pActor->spr.xvel;
         pActor->spr.pal  = (uint8_t)pActor->spr.yvel;
-        pActor->spr.yvel = pActor->spr.zvel; // setting to 0
-        pActor->spr.xvel = pActor->spr.zvel; // setting to 0
+        pActor->spr.yvel = pActor->int_zvel(); // setting to 0
+        pActor->spr.xvel = pActor->int_zvel(); // setting to 0
 
         if (pActor->spr.statnum == kStatExplodeTrigger) {
             pActor->spr.cstat = CSTAT_SPRITE_BLOCK_ALL;
diff --git a/source/games/exhumed/src/lavadude.cpp b/source/games/exhumed/src/lavadude.cpp
index 1ed2c34f8..d8f850c38 100644
--- a/source/games/exhumed/src/lavadude.cpp
+++ b/source/games/exhumed/src/lavadude.cpp
@@ -73,7 +73,7 @@ void AILavaDudeLimb::Tick(RunListEvent* ev)
 
     pActor->spr.shade += 3;
 
-    auto coll = movesprite(pActor, pActor->spr.xvel << 12, pActor->spr.yvel << 12, pActor->spr.zvel, 2560, -2560, CLIPMASK1);
+    auto coll = movesprite(pActor, pActor->spr.xvel << 12, pActor->spr.yvel << 12, pActor->int_zvel(), 2560, -2560, CLIPMASK1);
 
     if (coll.type || pActor->spr.shade > 100)
     {
diff --git a/source/games/exhumed/src/move.cpp b/source/games/exhumed/src/move.cpp
index 9f7a8afeb..71dfbc4ae 100644
--- a/source/games/exhumed/src/move.cpp
+++ b/source/games/exhumed/src/move.cpp
@@ -612,7 +612,7 @@ void Gravity(DExhumedActor* pActor)
 
 Collision MoveCreature(DExhumedActor* pActor)
 {
-    return movesprite(pActor, pActor->spr.xvel << 8, pActor->spr.yvel << 8, pActor->spr.zvel, 15360, -5120, CLIPMASK0);
+    return movesprite(pActor, pActor->spr.xvel << 8, pActor->spr.yvel << 8, pActor->int_zvel(), 15360, -5120, CLIPMASK0);
 }
 
 Collision MoveCreatureWithCaution(DExhumedActor* pActor)
@@ -1150,7 +1150,7 @@ Collision AngleChase(DExhumedActor* pActor, DExhumedActor* pActor2, int ebx, int
         }
 
         nAngle = (nAngDelta + pActor->int_ang()) & kAngleMask;
-        int nAngDeltaD = AngleDelta(pActor->spr.zvel, var_18, 24);
+        int nAngDeltaD = AngleDelta(pActor->int_zvel(), var_18, 24);
 
         pActor->spr.zvel = (pActor->spr.zvel + nAngDeltaD) & kAngleMask;
     }
@@ -1352,7 +1352,7 @@ void AICreatureChunk::Tick(RunListEvent* ev)
     auto pSector = pActor->sector();
     pActor->spr.pal = pSector->ceilingpal;
 
-    auto nVal = movesprite(pActor, pActor->spr.xvel << 10, pActor->spr.yvel << 10, pActor->spr.zvel, 2560, -2560, CLIPMASK1);
+    auto nVal = movesprite(pActor, pActor->spr.xvel << 10, pActor->spr.yvel << 10, pActor->int_zvel(), 2560, -2560, CLIPMASK1);
 
     if (pActor->spr.pos.Z >= pSector->floorz)
     {
@@ -1381,7 +1381,7 @@ void AICreatureChunk::Tick(RunListEvent* ev)
             {
                 pActor->spr.xvel >>= 1;
                 pActor->spr.yvel >>= 1;
-                pActor->spr.zvel = -pActor->spr.zvel;
+                pActor->spr.zvel = -pActor->int_zvel();
                 return;
             }
             else if (nVal.type == kHitSprite)
diff --git a/source/games/exhumed/src/object.cpp b/source/games/exhumed/src/object.cpp
index 41141b119..fcbfa7e89 100644
--- a/source/games/exhumed/src/object.cpp
+++ b/source/games/exhumed/src/object.cpp
@@ -1436,7 +1436,7 @@ void AISpark::Tick(RunListEvent* ev)
 
         pActor->spr.zvel += 128;
 
-        auto nMov = movesprite(pActor, pActor->spr.xvel << 12, pActor->spr.yvel << 12, pActor->spr.zvel, 2560, -2560, CLIPMASK1);
+        auto nMov = movesprite(pActor, pActor->spr.xvel << 12, pActor->spr.yvel << 12, pActor->int_zvel(), 2560, -2560, CLIPMASK1);
         if (!nMov.type && !nMov.exbits) {
             return;
         }
@@ -1888,7 +1888,7 @@ void AIObject::Tick(RunListEvent* ev)
     FUNCOBJECT_GOTO:
         if (nStat != kStatExplodeTarget)
         {
-            auto nMov = movesprite(pActor, pActor->spr.xvel << 6, pActor->spr.yvel << 6, pActor->spr.zvel, 0, 0, CLIPMASK0);
+            auto nMov = movesprite(pActor, pActor->spr.xvel << 6, pActor->spr.yvel << 6, pActor->int_zvel(), 0, 0, CLIPMASK0);
 
             if (pActor->spr.statnum == kStatExplodeTrigger) {
                 pActor->spr.pal = 1;
diff --git a/source/games/exhumed/src/player.cpp b/source/games/exhumed/src/player.cpp
index 30a6306c9..5024220e0 100644
--- a/source/games/exhumed/src/player.cpp
+++ b/source/games/exhumed/src/player.cpp
@@ -830,7 +830,7 @@ void AIPlayer::Tick(RunListEvent* ev)
     }
 
     // pPlayerActor->spr.zvel is modified within Gravity()
-    int zVel = pPlayerActor->spr.zvel;
+    int zVel = pPlayerActor->int_zvel();
 
     Gravity(pPlayerActor);
 
@@ -865,7 +865,7 @@ void AIPlayer::Tick(RunListEvent* ev)
     // TODO
     // nSectFlag & kSectUnderwater;
 
-    zVel = pPlayerActor->spr.zvel;
+    zVel = pPlayerActor->int_zvel();
 
     Collision nMove;
     nMove.setNone();
diff --git a/source/games/exhumed/src/queen.cpp b/source/games/exhumed/src/queen.cpp
index 7bf6ece4c..535c7f608 100644
--- a/source/games/exhumed/src/queen.cpp
+++ b/source/games/exhumed/src/queen.cpp
@@ -325,12 +325,12 @@ Collision QueenAngleChase(DExhumedActor* pActor, DExhumedActor* pActor2, int val
 
         nAngle = (nAngDelta + pActor->int_ang()) & kAngleMask;
 
-        pActor->spr.zvel = (AngleDelta(pActor->spr.zvel, var_14, 24) + pActor->spr.zvel) & kAngleMask;
+        pActor->spr.zvel = (AngleDelta(pActor->int_zvel(), var_14, 24) + pActor->spr.zvel) & kAngleMask;
     }
 
     pActor->set_int_ang(nAngle);
 
-    int da = pActor->spr.zvel;
+    int da = pActor->int_zvel();
     int x = abs(bcos(da));
 
     int v26 = x * ((val1 * bcos(nAngle)) >> 14);
diff --git a/source/games/exhumed/src/set.cpp b/source/games/exhumed/src/set.cpp
index 2b0d6a3b2..fa5e34f72 100644
--- a/source/games/exhumed/src/set.cpp
+++ b/source/games/exhumed/src/set.cpp
@@ -139,7 +139,7 @@ void AISoul::Tick(RunListEvent* ev)
 
     int nVel = bcos(pActor->spr.extra, -7);
 
-	auto coll = movesprite(pActor, bcos(pActor->int_ang()) * nVel, bsin(pActor->int_ang()) * nVel, pActor->spr.zvel, 5120, 0, CLIPMASK0);
+	auto coll = movesprite(pActor, bcos(pActor->int_ang()) * nVel, bsin(pActor->int_ang()) * nVel, pActor->int_zvel(), 5120, 0, CLIPMASK0);
     if (coll.exbits & 0x10000)
     {
 		DExhumedActor* pSet = pActor->pTarget;
diff --git a/source/games/exhumed/src/spider.cpp b/source/games/exhumed/src/spider.cpp
index bbacce89f..e60607b02 100644
--- a/source/games/exhumed/src/spider.cpp
+++ b/source/games/exhumed/src/spider.cpp
@@ -275,7 +275,7 @@ void AISpider::Tick(RunListEvent* ev)
         spp->spr.yvel = 0;
     }
 
-    auto nMov = movesprite(spp, spp->spr.xvel << nVel, spp->spr.yvel << nVel, spp->spr.zvel, 1280, -1280, CLIPMASK0);
+    auto nMov = movesprite(spp, spp->spr.xvel << nVel, spp->spr.yvel << nVel, spp->int_zvel(), 1280, -1280, CLIPMASK0);
 
     if (nMov.type == kHitNone && nMov.exbits == 0)
         return;
diff --git a/source/games/sw/src/weapon.cpp b/source/games/sw/src/weapon.cpp
index 6018b4197..da9130574 100644
--- a/source/games/sw/src/weapon.cpp
+++ b/source/games/sw/src/weapon.cpp
@@ -9291,7 +9291,7 @@ int SpawnExtraMicroMini(DSWActor* actor)
     actorNew->spr.cstat = actor->spr.cstat;
 
     actorNew->set_int_ang(NORM_ANGLE(actorNew->int_ang() + RandomRange(64) - 32));
-    actorNew->spr.zvel = actor->spr.zvel;
+    actorNew->spr.zvel = actor->int_zvel();
     actorNew->spr.zvel += RandomRange(Z(16)) - Z(8);
 
 	UpdateChange(actorNew);
@@ -9319,7 +9319,7 @@ int DoMicro(DSWActor* actor)
         actorNew->spr.xrepeat = 20;
         actorNew->spr.yrepeat = 20;
         actorNew->opos = actor->opos;
-        actorNew->spr.zvel = actor->spr.zvel;
+        actorNew->spr.zvel = actor->int_zvel();
         actorNew->spr.cstat |= (CSTAT_SPRITE_YCENTER);
         actorNew->spr.cstat &= ~(CSTAT_SPRITE_BLOCK|CSTAT_SPRITE_BLOCK_HITSCAN);
 
@@ -10883,7 +10883,7 @@ bool MissileSetPos(DSWActor* actor, ANIMATOR* DoWeapon, int dist)
     // backup values
 	auto oldc = actor->user.change;
     oldvel = actor->spr.xvel;
-    oldzvel = actor->spr.zvel;
+    oldzvel = actor->int_zvel();
 
     // make missile move in smaller increments
     actor->spr.xvel = short((dist * 6) / MISSILEMOVETICS);
@@ -10917,7 +10917,7 @@ bool TestMissileSetPos(DSWActor* actor, ANIMATOR* DoWeapon, int dist, int zvel)
     // backup values
 	auto oldc = actor->user.change;
     oldvel = actor->spr.xvel;
-    oldzvel = actor->spr.zvel;
+    oldzvel = actor->int_zvel();
 
     // make missile move in smaller increments
     actor->spr.xvel = short((dist * 6) / MISSILEMOVETICS);
@@ -12406,7 +12406,7 @@ int InitStar(PLAYER* pp)
 
     if (WeaponAutoAim(pp->actor, actorNew, 32, false) != -1)
     {
-        zvel = actorNew->spr.zvel;
+        zvel = actorNew->int_zvel();
     }
 
 	UpdateChangeXY(actorNew);
@@ -12919,7 +12919,7 @@ int InitRail(PLAYER* pp)
         actorNew->set_int_ang(NORM_ANGLE(actorNew->int_ang() - 4));
     }
     else
-        zvel = actorNew->spr.zvel;  // Let autoaiming set zvel now
+        zvel = actorNew->int_zvel();  // Let autoaiming set zvel now
 
 	UpdateChangeXY(actorNew);
     actorNew->user.set_int_change_z(zvel);
@@ -12987,7 +12987,7 @@ int InitZillaRail(DSWActor* actor)
         actorNew->spr.angle -= DAngle::fromBuild(4);
     }
     else
-        zvel = actorNew->spr.zvel;  // Let autoaiming set zvel now
+        zvel = actorNew->int_zvel();  // Let autoaiming set zvel now
 
 	UpdateChangeXY(actorNew);
     actorNew->user.set_int_change_z(zvel);
@@ -13096,7 +13096,7 @@ int InitRocket(PLAYER* pp)
         actorNew->set_int_ang(NORM_ANGLE(actorNew->int_ang() - 5));
     }
     else
-        zvel = actorNew->spr.zvel;  // Let autoaiming set zvel now
+        zvel = actorNew->int_zvel();  // Let autoaiming set zvel now
 
 	UpdateChangeXY(actorNew);
     actorNew->user.set_int_change_z(zvel);
@@ -13200,7 +13200,7 @@ int InitBunnyRocket(PLAYER* pp)
         actorNew->set_int_ang(NORM_ANGLE(actorNew->int_ang() - 5));
     }
     else
-        zvel = actorNew->spr.zvel;  // Let autoaiming set zvel now
+        zvel = actorNew->int_zvel();  // Let autoaiming set zvel now
 
 	UpdateChangeXY(actorNew);
     actorNew->user.set_int_change_z(zvel);
@@ -13292,7 +13292,7 @@ int InitNuke(PLAYER* pp)
         actorNew->set_int_ang(NORM_ANGLE(actorNew->int_ang() - 5));
     }
     else
-        zvel = actorNew->spr.zvel;  // Let autoaiming set zvel now
+        zvel = actorNew->int_zvel();  // Let autoaiming set zvel now
 
 	UpdateChangeXY(actorNew);
     actorNew->user.set_int_change_z(zvel);
@@ -13368,7 +13368,7 @@ int InitEnemyNuke(DSWActor* actor)
         actorNew->set_int_ang(NORM_ANGLE(actorNew->int_ang() - 5));
     }
     else
-        zvel = actorNew->spr.zvel;  // Let autoaiming set zvel now
+        zvel = actorNew->int_zvel();  // Let autoaiming set zvel now
 
 	UpdateChangeXY(actorNew);
     actorNew->user.set_int_change_z(zvel);
@@ -15910,7 +15910,7 @@ int InitGrenade(PLAYER* pp)
 
     actor->spr.clipdist = oclipdist;
 
-    zvel = actorNew->spr.zvel;
+    zvel = actorNew->int_zvel();
     if (WeaponAutoAim(pp->actor, actorNew, 32, false) >= 0)
     {
         auto_aim = true;
@@ -16233,7 +16233,7 @@ int InitEnemyFireball(DSWActor* actor)
                 actorNew->user.set_int_change_z(actorNew->spr.zvel = (GORO_FIREBALL_VELOCITY * (targ_z - actorNew->int_pos().Z)) / dist);
 
             // back up first one
-            lastvel = actorNew->spr.zvel;
+            lastvel = actorNew->int_zvel();
         }
         else
         {