diff --git a/source/games/duke/src/actors.cpp b/source/games/duke/src/actors.cpp
index 568801712..35e8fc89d 100644
--- a/source/games/duke/src/actors.cpp
+++ b/source/games/duke/src/actors.cpp
@@ -315,7 +315,7 @@ void movecyclers(void)
 	for (int q = numcyclers - 1; q >= 0; q--)
 	{
 		Cycler* c = &cyclers[q];
-		auto sect = c->sector();
+		auto sect = c->sector;
 
 		int t = c->shade2;
 		int j = t + bsin(c->lotag, -10);
diff --git a/source/games/duke/src/actors_r.cpp b/source/games/duke/src/actors_r.cpp
index 450be26df..20d143b3d 100644
--- a/source/games/duke/src/actors_r.cpp
+++ b/source/games/duke/src/actors_r.cpp
@@ -38,10 +38,10 @@ void dojaildoor();
 void moveminecart();
 
 void ballreturn(DDukeActor* spr);
-void pinsectorresetdown(int sect);
-int pinsectorresetup(int sect);
-int checkpins(int sect);
-void resetpins(int sect);
+void pinsectorresetdown(sectortype* sect);
+int pinsectorresetup(sectortype* sect);
+int checkpins(sectortype* sect);
+void resetpins(sectortype* sect);
 void resetlanepics(void);
 
 
@@ -2433,13 +2433,13 @@ void rr_specialstats()
 		if (s->picnum == BOWLINGPINSPOT)
 			if (s->lotag == 100)
 			{
-				auto pst = pinsectorresetup(s->sectnum);
+				auto pst = pinsectorresetup(s->sector());
 				if (pst)
 				{
 					s->lotag = 0;
 					if (s->extra == 1)
 					{
-						pst = checkpins(s->sectnum);
+						pst = checkpins(s->sector());
 						if (!pst)
 						{
 							s->extra = 2;
@@ -2448,7 +2448,7 @@ void rr_specialstats()
 					if (s->extra == 2)
 					{
 						s->extra = 0;
-						resetpins(s->sectnum);
+						resetpins(s->sector());
 					}
 				}
 			}
@@ -4097,7 +4097,7 @@ void destroyit(DDukeActor *actor)
 	DukeStatIterator it(STAT_DESTRUCT);
 	while (auto a2 = it.Next())
 	{
-		int it_sect = a2->s->sectnum;
+		auto it_sect = a2->s->sector();
 		if (hitag && hitag == a2->s->hitag)
 		{
 			DukeSectIterator its(it_sect);
@@ -4110,13 +4110,13 @@ void destroyit(DDukeActor *actor)
 				}
 			}
 		}
-		if (spr && spr->s->sectnum != it_sect)
+		if (spr && spr->s->sector() != it_sect)
 			if (lotag == a2->s->lotag)
 			{
 				sectnum = spr->s->sectnum;
 
 				auto destsect = spr->getSector();
-				auto srcsect = &sector[it_sect];
+				auto srcsect = it_sect;
 
 				auto destwal = destsect->firstWall();
 				auto srcwal = srcsect->firstWall();
@@ -4152,7 +4152,7 @@ void destroyit(DDukeActor *actor)
 				destsect->floorxpan_ = srcsect->floorxpan_;
 				destsect->floorypan_ = srcsect->floorypan_;
 				destsect->visibility = srcsect->visibility;
-				sectorextra[sectnum] = sectorextra[it_sect]; // TRANSITIONAL: at least rename this.
+				sectorextra[sectnum] = sectorextra[::sectnum(it_sect)]; // TRANSITIONAL: at least rename this.
 				destsect->lotag = srcsect->lotag;
 				destsect->hitag = srcsect->hitag;
 				destsect->extra = srcsect->extra;
diff --git a/source/games/duke/src/bowling.cpp b/source/games/duke/src/bowling.cpp
index 963321cff..0ce463c6c 100644
--- a/source/games/duke/src/bowling.cpp
+++ b/source/games/duke/src/bowling.cpp
@@ -50,16 +50,15 @@ void ballreturn(DDukeActor *ball)
 				{
 					act2->s->lotag = 100;
 					act2->s->extra++;
-					pinsectorresetdown(act2->s->sectnum);
+					pinsectorresetdown(act2->getSector());
 				}
 			}
 		}
 	}
 }
 
-void pinsectorresetdown(int sect)
+void pinsectorresetdown(sectortype* sec)
 {
-	auto sec = &sector[sect];
 	int j = getanimationgoal(anim_ceilingz, sec);
 
 	if (j == -1)
@@ -69,9 +68,8 @@ void pinsectorresetdown(int sect)
 	}
 }
 
-int pinsectorresetup(int sect)
+int pinsectorresetup(sectortype* sec)
 {
-	auto sec = &sector[sect];
 	int j = getanimationgoal(anim_ceilingz, sec);
 
 	if (j == -1)
@@ -83,7 +81,7 @@ int pinsectorresetup(int sect)
 	return 0;
 }
 
-int checkpins(int sect)
+int checkpins(sectortype* sect)
 {
 	int  x, y;
 	bool pins[10] = {};
@@ -165,7 +163,7 @@ int checkpins(int sect)
 	return pin;
 }
 
-void resetpins(int sect)
+void resetpins(sectortype* sect)
 {
 	int i, tag = 0;
 	int x, y;
diff --git a/source/games/duke/src/player_r.cpp b/source/games/duke/src/player_r.cpp
index 0f0c590b4..47c2b9191 100644
--- a/source/games/duke/src/player_r.cpp
+++ b/source/games/duke/src/player_r.cpp
@@ -2674,12 +2674,12 @@ static void fireweapon(int snum)
 //
 //---------------------------------------------------------------------------
 
-static void operateweapon(int snum, ESyncBits actions, int psect)
+static void operateweapon(int snum, ESyncBits actions, sectortype* psectp)
 {
 	auto p = &ps[snum];
 	auto pact = p->GetActor();
 	int i, k;
-	int psectlotag = sector[psect].lotag;
+	int psectlotag = psectp->lotag;
 
 	if (!isRRRA() && p->curr_weapon >= MOTORCYCLE_WEAPON) return;
 	switch (p->curr_weapon)
@@ -3266,7 +3266,7 @@ static void operateweapon(int snum, ESyncBits actions, int psect)
 //
 //---------------------------------------------------------------------------
 
-static void processweapon(int snum, ESyncBits actions, int psect)
+static void processweapon(int snum, ESyncBits actions, sectortype* psectp)
 {
 	auto p = &ps[snum];
 	auto pact = p->GetActor();
@@ -3312,7 +3312,7 @@ static void processweapon(int snum, ESyncBits actions, int psect)
 	}
 	else if (p->kickback_pic)
 	{
-		operateweapon(snum, actions, psect);
+		operateweapon(snum, actions, psectp);
 	}
 }
 
@@ -3543,7 +3543,7 @@ void processinput_r(int snum)
 
 		fi.doincrements(p);
 
-		if (p->curr_weapon == THROWINGDYNAMITE_WEAPON) processweapon(snum, actions, psect);
+		if (p->curr_weapon == THROWINGDYNAMITE_WEAPON) processweapon(snum, actions, psectp);
 		return;
 	}
 
@@ -3887,7 +3887,7 @@ HORIZONLY:
 	if (psectlotag < 3)
 	{
 		psect = s->sectnum;
-		psectp = &sector[psect];
+		psectp = s->sector();
 		if (ud.clipping == 0 && psectp->lotag == ST_31_TWO_WAY_TRAIN)
 		{
 			auto act = ScriptIndexToActor(psectp->hitag);
@@ -4007,7 +4007,7 @@ HORIZONLY:
 		else p->weapon_pos--;
 	}
 
-	processweapon(snum, actions, psect);
+	processweapon(snum, actions, psectp);
 }
 
 //---------------------------------------------------------------------------
diff --git a/source/games/duke/src/premap_d.cpp b/source/games/duke/src/premap_d.cpp
index 646d5de7b..47c766cd1 100644
--- a/source/games/duke/src/premap_d.cpp
+++ b/source/games/duke/src/premap_d.cpp
@@ -298,7 +298,7 @@ void prelevel_d(int g)
 		case CYCLER:
 			if (numcyclers >= MAXCYCLERS)
 				I_Error("Too many cycling sectors.");
-			cyclers[numcyclers].sectnum = si->sectnum;
+			cyclers[numcyclers].sector = si->sector();
 			cyclers[numcyclers].lotag = si->lotag;
 			cyclers[numcyclers].shade1 = si->shade;
 			cyclers[numcyclers].shade2 = si->sector()->floorshade;
diff --git a/source/games/duke/src/premap_r.cpp b/source/games/duke/src/premap_r.cpp
index 17b5d539d..7911df95a 100644
--- a/source/games/duke/src/premap_r.cpp
+++ b/source/games/duke/src/premap_r.cpp
@@ -549,7 +549,7 @@ void prelevel_r(int g)
 		case CYCLER:
 			if (numcyclers >= MAXCYCLERS)
 				I_Error("Too many cycling sectors.");
-			cyclers[numcyclers].sectnum = si->sectnum;
+			cyclers[numcyclers].sector = si->sector();
 			cyclers[numcyclers].lotag = si->lotag;
 			cyclers[numcyclers].shade1 = si->shade;
 			cyclers[numcyclers].shade2 = si->sector()->floorshade;
diff --git a/source/games/duke/src/savegame.cpp b/source/games/duke/src/savegame.cpp
index 45b44f41d..33a7f27c2 100644
--- a/source/games/duke/src/savegame.cpp
+++ b/source/games/duke/src/savegame.cpp
@@ -339,7 +339,7 @@ FSerializer& Serialize(FSerializer& arc, const char* keyname, Cycler& w, Cycler*
 	if (!def) def = &nul;
 	if (arc.BeginObject(keyname))
 	{
-		arc("sector", w.sectnum, def->sectnum)
+		arc("sector", w.sector, def->sector)
 			("lotag", w.lotag, def->lotag)
 			("hitag", w.hitag, def->hitag)
 			("shade1", w.shade1, def->shade1)
diff --git a/source/games/duke/src/sectors.cpp b/source/games/duke/src/sectors.cpp
index 7663fdceb..f52a3042b 100644
--- a/source/games/duke/src/sectors.cpp
+++ b/source/games/duke/src/sectors.cpp
@@ -1086,7 +1086,7 @@ void operateactivators(int low, int plnum)
 
 		if (p->hitag == low)
 		{
-			auto sect = p->sector();
+			auto sect = p->sector;
 			p->state = !p->state;
 
 			sect->floorshade = sect->ceilingshade = (int8_t)p->shade2;
diff --git a/source/games/duke/src/types.h b/source/games/duke/src/types.h
index 09e3933d7..b564d7720 100644
--- a/source/games/duke/src/types.h
+++ b/source/games/duke/src/types.h
@@ -97,7 +97,7 @@ struct DDukeActor
 
 	sectortype* getSector() const
 	{
-		return &sector[s->sectnum];
+		return s->sector();
 	}
 
 
@@ -318,14 +318,12 @@ struct player_struct
 
 struct Cycler
 {
-	int sectnum;
+	sectortype* sector;
 	int16_t lotag;
 	int16_t hitag;
 	int16_t shade1;
 	int16_t shade2;
 	bool state;
-
-	sectortype* sector() const { return &::sector[sectnum]; }
 };
 
 // Wrapper around the insane collision info mess from Build.