diff --git a/source/core/coreactor.h b/source/core/coreactor.h
index 4c54a5447..fd2e1745d 100644
--- a/source/core/coreactor.h
+++ b/source/core/coreactor.h
@@ -122,11 +122,6 @@ public:
 		vel.Z = v * zinttoworld;
 	}
 
-	void add_int_zvel(int v)
-	{
-		vel.Z += v * zinttoworld;
-	}
-
 	// Note: Both Duke and SW use Q12.4 for this, Exhumed doesn't seem to treat horizontal velocity with a fixed factor.
 	int int_xvel() const
 	{
diff --git a/source/games/duke/src/actors_d.cpp b/source/games/duke/src/actors_d.cpp
index 435e49874..ef093ceee 100644
--- a/source/games/duke/src/actors_d.cpp
+++ b/source/games/duke/src/actors_d.cpp
@@ -3507,7 +3507,7 @@ void move_d(DDukeActor *actor, int playernum, int xvel)
 	if ((a & jumptoplayer) == jumptoplayer)
 	{
 		if (actor->temp_data[0] < 16)
-			actor->add_int_zvel(- bcos(actor->temp_data[0] << 4, -5));
+			actor->vel.Z += BobVal(512 + (actor->temp_data[0] << 4)) * 2;
 	}
 
 	if (a & face_player_smart)
diff --git a/source/games/duke/src/player_d.cpp b/source/games/duke/src/player_d.cpp
index 47801edc0..d8003ff04 100644
--- a/source/games/duke/src/player_d.cpp
+++ b/source/games/duke/src/player_d.cpp
@@ -805,7 +805,7 @@ static void shootrpg(DDukeActor *actor, int p, int sx, int sy, int sz, int sa, i
 	{
 		spawned->spr.extra >>= 2;
 		spawned->add_int_ang(16 - (krand() & 31));
-		spawned->add_int_zvel( 256 - (krand() & 511));
+		spawned->vel.Z += 1 - krandf(2);
 
 		if (ps[p].hbomb_hold_delay)
 		{
diff --git a/source/games/duke/src/player_r.cpp b/source/games/duke/src/player_r.cpp
index 10243b8a3..6d3277981 100644
--- a/source/games/duke/src/player_r.cpp
+++ b/source/games/duke/src/player_r.cpp
@@ -716,7 +716,7 @@ static void shootrpg(DDukeActor* actor, int p, int sx, int sy, int sz, int sa, i
 	{
 		spawned->spr.extra >>= 2;
 		spawned->add_int_ang(16 - (krand() & 31));
-		spawned->add_int_zvel( 256 - (krand() & 511));
+		spawned->vel.Z += 1 - krandf(2);
 
 		if (ps[p].hbomb_hold_delay)
 		{