diff --git a/source/games/duke/src/player_r.cpp b/source/games/duke/src/player_r.cpp
index c04cd9fb3..ada84045c 100644
--- a/source/games/duke/src/player_r.cpp
+++ b/source/games/duke/src/player_r.cpp
@@ -1721,7 +1721,7 @@ static void onMotorcycle(int snum, ESyncBits &actions)
 	if (p->MotoSpeed != 0 && p->on_ground == 1)
 	{
 		if (!p->VBumpNow && (krand() & 3) == 2)
-			p->VBumpTarget = short((p->MotoSpeed / 16.) * ((krand() & 7) - 4));
+			p->VBumpTarget = p->MotoSpeed * (1. / 16.) * ((krand() & 7) - 4);
 
 		if (p->vehTurnLeft || p->moto_drink < 0)
 		{
@@ -1757,14 +1757,14 @@ static void onMotorcycle(int snum, ESyncBits &actions)
 		p->VBumpNow += p->moto_bump_fast ? 6 : 1;
 		if (p->VBumpTarget < p->VBumpNow)
 			p->VBumpNow = p->VBumpTarget;
-		horiz = p->VBumpNow / 3.;
+		horiz = p->VBumpNow * (1. / 3.);
 	}
 	else if (p->VBumpTarget < p->VBumpNow)
 	{
 		p->VBumpNow -= p->moto_bump_fast ? 6 : 1;
 		if (p->VBumpTarget > p->VBumpNow)
 			p->VBumpNow = p->VBumpTarget;
-		horiz = p->VBumpNow / 3.;
+		horiz = p->VBumpNow * (1. / 3.);
 	}
 	else
 	{
@@ -1991,7 +1991,7 @@ static void onBoat(int snum, ESyncBits &actions)
 	if (p->MotoSpeed != 0 && p->on_ground == 1)
 	{
 		if (!p->VBumpNow && (krand() & 15) == 14)
-			p->VBumpTarget = short((p->MotoSpeed / 16.) * ((krand() & 3) - 2));
+			p->VBumpTarget = p->MotoSpeed * (1. / 16.) * ((krand() & 3) - 2);
 
 		if (p->vehTurnLeft && p->moto_drink < 0)
 		{
@@ -2025,14 +2025,14 @@ static void onBoat(int snum, ESyncBits &actions)
 		p->VBumpNow += p->moto_bump_fast ? 6 : 1;
 		if (p->VBumpTarget < p->VBumpNow)
 			p->VBumpNow = p->VBumpTarget;
-		horiz = p->VBumpNow / 3.;
+		horiz = p->VBumpNow * (1. / 3.);
 	}
 	else if (p->VBumpTarget < p->VBumpNow)
 	{
 		p->VBumpNow -= p->moto_bump_fast ? 6 : 1;
 		if (p->VBumpTarget > p->VBumpNow)
 			p->VBumpNow = p->VBumpTarget;
-		horiz = p->VBumpNow / 3.;
+		horiz = p->VBumpNow * (1. / 3.);
 	}
 	else
 	{
diff --git a/source/games/duke/src/types.h b/source/games/duke/src/types.h
index ec9d60cd6..246e8b701 100644
--- a/source/games/duke/src/types.h
+++ b/source/games/duke/src/types.h
@@ -283,7 +283,8 @@ struct player_struct
 	short MamaEnd; // raat609
 	short moto_drink;
 	float TiltStatus, oTiltStatus;
-	short VBumpNow, VBumpTarget, TurbCount;
+	double VBumpNow, VBumpTarget;
+	short TurbCount;
 	short drug_stat[3]; // raat5f1..5
 	uint8_t DrugMode, lotag800kill;
 	uint8_t sea_sick_stat; // raat5dd
diff --git a/wadsrc/static/zscript/games/duke/dukegame.zs b/wadsrc/static/zscript/games/duke/dukegame.zs
index a28297d11..5849a7d5c 100644
--- a/wadsrc/static/zscript/games/duke/dukegame.zs
+++ b/wadsrc/static/zscript/games/duke/dukegame.zs
@@ -229,7 +229,8 @@ struct DukePlayer
 	native int16 MamaEnd; // raat609
 	native int16 moto_drink;
 	native float TiltStatus, oTiltStatus;
-	native int16 VBumpNow, VBumpTarget, TurbCount;
+	native double VBumpNow, VBumpTarget;
+	native int16 TurbCount;
 	native int16 drug_stat[3]; // raat5f1..5
 	native uint8 DrugMode, lotag800kill;
 	native uint8 sea_sick_stat; // raat5dd