diff --git a/source/games/sw/src/game.h b/source/games/sw/src/game.h
index 96a11a924..3908e6aed 100644
--- a/source/games/sw/src/game.h
+++ b/source/games/sw/src/game.h
@@ -1412,11 +1412,7 @@ struct SECTOR_OBJECT
 
     TObjPtr<DSWActor*> sp_child;  // child sprite that holds info for the sector object
 
-    union
-    {
-        struct { int BLAHBLAHX, BLAHBLAHY, zmid; };  // midpoints of the sector object
-        vec3_t pmid;
-    };
+    vec3_t pmid;  // midpoints of the sector object
 
 	TObjPtr<DSWActor*> so_actors[MAX_SO_SPRITE];    // hold the actors of the object
 	TObjPtr<DSWActor*> match_event_actor; // spritenum of the match event sprite
@@ -2138,7 +2134,7 @@ struct ANIM
 		case ANIM_Floorz:
             return *sector[animindex].floorzptr(!write);
 		case ANIM_SopZ:
-			return SectorObject[animindex].zmid;
+			return SectorObject[animindex].pmid.Z;
 		case ANIM_Spritez:
             if (animactor == nullptr) return scratch;
 			return animactor->spr.pos.Z;
diff --git a/source/games/sw/src/interpso.cpp b/source/games/sw/src/interpso.cpp
index 7f560a59e..bccf9478d 100644
--- a/source/games/sw/src/interpso.cpp
+++ b/source/games/sw/src/interpso.cpp
@@ -110,7 +110,7 @@ static int &getvalue(so_interp::interp_data& element, bool write)
     case soi_soy:
         return SectorObject[index].pmid.Y;
     case soi_soz:
-        return SectorObject[index].zmid;
+        return SectorObject[index].pmid.Z;
     case soi_sprx:
 		if (element.actorofang)
 			return element.actorofang->spr.pos.X;
diff --git a/source/games/sw/src/player.cpp b/source/games/sw/src/player.cpp
index 1c1638efc..309363342 100644
--- a/source/games/sw/src/player.cpp
+++ b/source/games/sw/src/player.cpp
@@ -4834,7 +4834,7 @@ void FindMainSector(SECTOR_OBJECT* sop)
         // set it to something valid
         sop->op_main_sector = &sector[0];
 
-        updatesectorz(sx, sy, sop->zmid, &sop->op_main_sector);
+        updatesectorz(sx, sy, sop->pmid.Z, &sop->op_main_sector);
 
         PlaceSectorObject(sop, sx, sy);
     }
diff --git a/source/games/sw/src/save.cpp b/source/games/sw/src/save.cpp
index 645a2755e..85c2c00ca 100644
--- a/source/games/sw/src/save.cpp
+++ b/source/games/sw/src/save.cpp
@@ -638,7 +638,7 @@ FSerializer& Serialize(FSerializer& arc, const char* keyname, SECTOR_OBJECT& w,
 			("child", w.sp_child, def->sp_child)
 			("xmid", w.pmid.X, def->pmid.X)
 			("ymid", w.pmid.Y, def->pmid.Y)
-			("zmid", w.zmid, def->zmid)
+			("zmid", w.pmid.Z, def->pmid.Z)
 			("vel", w.vel, def->vel)
 			("vel_tgt", w.vel_tgt, def->vel_tgt)
 			("player_xoff", w.player_xoff, def->player_xoff)
diff --git a/source/games/sw/src/track.cpp b/source/games/sw/src/track.cpp
index a3af0cd8e..337b1cacf 100644
--- a/source/games/sw/src/track.cpp
+++ b/source/games/sw/src/track.cpp
@@ -718,7 +718,7 @@ void SectorObjectSetupBounds(SECTOR_OBJECT* sop)
     {
         sop->pmid.X = BoundActor->spr.pos.X;
         sop->pmid.Y = BoundActor->spr.pos.Y;
-        sop->zmid = BoundActor->spr.pos.Z;
+        sop->pmid.Z = BoundActor->spr.pos.Z;
         KillActor(BoundActor);
     }
 
@@ -943,12 +943,12 @@ cont:
 
         ASSERT(zmid != -9999999);
 
-        sop->zmid = zmid;
+        sop->pmid.Z = zmid;
 
 		for (i = 0; sop->so_actors[i] != nullptr; i++)
 		{
             auto actor = sop->so_actors[i];
-            actor->user.pos.Z = sop->zmid - actor->spr.pos.Z;
+            actor->user.pos.Z = sop->pmid.Z - actor->spr.pos.Z;
         }
     }
 }
@@ -1037,14 +1037,14 @@ void SetupSectorObject(sectortype* sectp, short tag)
     case TAG_OBJECT_CENTER - 500:
 
         sop->mid_sector = sectp;
-        SectorMidPoint(sectp, &sop->pmid.X, &sop->pmid.Y, &sop->zmid);
+        SectorMidPoint(sectp, &sop->pmid.X, &sop->pmid.Y, &sop->pmid.Z);
 
         sop->dir = 1;
         sop->track = sectp->hitag;
 
         // spawn a sprite to make it easier to integrate with sprite routines
         auto actorNew = SpawnActor(STAT_SO_SP_CHILD, 0, nullptr, sectp,
-                          sop->pmid.X, sop->pmid.Y, sop->zmid, 0, 0);
+                          sop->pmid.X, sop->pmid.Y, sop->pmid.Z, 0, 0);
         sop->sp_child = actorNew;
         actorNew->user.sop_parent = sop;
         actorNew->user.Flags2 |= (SPR2_SPRITE_FAKE_BLOCK); // for damage test
@@ -1608,7 +1608,7 @@ void MovePoints(SECTOR_OBJECT* sop, short delta_ang, int nx, int ny)
 
     // setting floorz if need be
     if ((sop->flags & SOBJ_ZMID_FLOOR))
-        sop->zmid = sop->mid_sector->floorz;
+        sop->pmid.Z = sop->mid_sector->floorz;
 
     for (sectp = sop->sectp, j = 0; *sectp; sectp++, j++)
     {
@@ -1708,7 +1708,7 @@ PlayerPart:
         if ((sop->flags & SOBJ_SPRITE_OBJ))
         {
             // Sprite Objects follow zmid
-            actor->spr.pos.Z = sop->zmid - actor->user.pos.Z;
+            actor->spr.pos.Z = sop->pmid.Z - actor->user.pos.Z;
         }
         else
         {
@@ -2524,7 +2524,7 @@ void DoTrack(SECTOR_OBJECT* sop, short locktics, int *nx, int *ny)
 
             // (velocity * difference between the target and the object)
             // / distance
-            sop->z_rate = (sop->vel * (sop->zmid - dz)) / dist;
+            sop->z_rate = (sop->vel * (sop->pmid.Z - dz)) / dist;
 
             // take absolute value and convert to pixels (divide by 256)
             sop->z_rate = PIXZ(labs(sop->z_rate));