diff --git a/source/games/duke/src/actors.cpp b/source/games/duke/src/actors.cpp
index 5d52064da..d6e0984e3 100644
--- a/source/games/duke/src/actors.cpp
+++ b/source/games/duke/src/actors.cpp
@@ -3051,7 +3051,7 @@ void handle_se17(DDukeActor* actor)
 				ps[p].posZadd(act2->sector()->floorz - sc->floorz);
 				ps[p].posoldAdd(ps[p].posGet());
 
-				if (q > 0) ps[p].backupz();
+				if (q > 0) ps[p].GetActor()->backupz();
 
 				act3->floorz = act2->sector()->floorz;
 				act3->ceilingz = act2->sector()->ceilingz;
diff --git a/source/games/duke/src/actors_d.cpp b/source/games/duke/src/actors_d.cpp
index 52ee0fe13..8bca88195 100644
--- a/source/games/duke/src/actors_d.cpp
+++ b/source/games/duke/src/actors_d.cpp
@@ -1374,7 +1374,7 @@ void movetransports_d(void)
 							if (ps[p].jetpack_on && (PlayerInput(p, SB_JUMP) || ps[p].jetpack_on < 11))
 								ps[p].posZset(Owner->spr.pos.Z - 24);
 							else ps[p].posZset(Owner->spr.pos.Z + 24);
-							ps[p].backupz();
+							ps[p].GetActor()->backupz();
 
 							auto pa = ps[p].GetActor();
 							pa->opos = ps[p].posGet();
@@ -1398,7 +1398,7 @@ void movetransports_d(void)
 						if (ps[p].GetActor()->spr.extra > 0)
 							S_PlayActorSound(DUKE_UNDERWATER, act2);
 						ps[p].posZset(Owner->sector()->ceilingz + 7);
-						ps[p].backupz();
+						ps[p].GetActor()->backupz();
 
 						// this is actually below the precision óf the original Build coordinate system...
 						ps[p].vel.X = ((krand() & 8192) ? 1 / 64. : -1 / 64.);
@@ -1417,7 +1417,7 @@ void movetransports_d(void)
 						S_PlayActorSound(DUKE_GASP, act2);
 
 						ps[p].posZset(Owner->sector()->floorz - 7);
-						ps[p].backupz();
+						ps[p].GetActor()->backupz();
 
 						ps[p].jumping_toggle = 1;
 						ps[p].jumping_counter = 0;
diff --git a/source/games/duke/src/actors_r.cpp b/source/games/duke/src/actors_r.cpp
index 61192575c..16a0cadbd 100644
--- a/source/games/duke/src/actors_r.cpp
+++ b/source/games/duke/src/actors_r.cpp
@@ -1259,7 +1259,7 @@ void movetransports_r(void)
 							if (ps[p].jetpack_on && (PlayerInput(p, SB_JUMP) || ps[p].jetpack_on < 11))
 								ps[p].posZset(Owner->spr.pos.Z - 24);
 							else ps[p].posZset(Owner->spr.pos.Z + 24);
-							ps[p].backupz();
+							ps[p].GetActor()->backupz();
 
 							ChangeActorSect(act2, Owner->sector());
 							ps[p].setCursector(Owner->sector());
@@ -1275,7 +1275,7 @@ void movetransports_r(void)
 						{
 							k = 2;
 							ps[p].posZset(Owner->sector()->ceilingz + 7);
-							ps[p].backupz();
+							ps[p].GetActor()->backupz();
 						}
 
 						if (onfloorz && sectlotag == 161 && ps[p].posZget() < sectp->ceilingz + 6)
@@ -1283,7 +1283,7 @@ void movetransports_r(void)
 							k = 2;
 							if (ps[p].GetActor()->spr.extra <= 0) break;
 							ps[p].posZset(Owner->sector()->floorz - 49);
-							ps[p].backupz();
+							ps[p].GetActor()->backupz();
 						}
 					}
 
@@ -1298,7 +1298,7 @@ void movetransports_r(void)
 						}
 						S_PlayActorSound(DUKE_UNDERWATER, ps[p].GetActor());
 						ps[p].posZset(Owner->sector()->ceilingz + 7);
-						ps[p].backupz();
+						ps[p].GetActor()->backupz();
 						if (ps[p].OnMotorcycle)
 							ps[p].moto_underwater = 1;
 					}
@@ -1314,7 +1314,7 @@ void movetransports_r(void)
 						S_PlayActorSound(DUKE_GASP, ps[p].GetActor());
 
 						ps[p].posZset(Owner->sector()->floorz - 7);
-						ps[p].backupz();
+						ps[p].GetActor()->backupz();
 					}
 
 					if (k == 1)
diff --git a/source/games/duke/src/types.h b/source/games/duke/src/types.h
index b27948ebc..6ed4fc883 100644
--- a/source/games/duke/src/types.h
+++ b/source/games/duke/src/types.h
@@ -330,11 +330,6 @@ struct player_struct
 		return cursector != nullptr;
 	}
 
-	void backupz()
-	{
-		GetActor()->opos.Z = GetActor()->spr.pos.Z;
-	}
-
 	void setbobpos()
 	{
 		bobpos = GetActor()->spr.pos.XY();