diff --git a/src/p_acs.cpp b/src/p_acs.cpp
index 2ffd2663f..5db1ac32c 100644
--- a/src/p_acs.cpp
+++ b/src/p_acs.cpp
@@ -3059,7 +3059,7 @@ int DLevelScript::CallFunction(int argCount, int funcIndex, SDWORD *args)
         case ACSF_SetActorVelocity:
             if (args[0] == 0)
             {
-				P_Thing_SetVelocity(activator, args[1], args[2], args[3], !!args[4]);
+				P_Thing_SetVelocity(activator, args[1], args[2], args[3], !!args[4], !!args[5]);
             }
             else
             {
@@ -3067,7 +3067,7 @@ int DLevelScript::CallFunction(int argCount, int funcIndex, SDWORD *args)
                 
                 while ( (actor = iterator.Next ()) )
                 {
-					P_Thing_SetVelocity(actor, args[1], args[2], args[3], !!args[4]);
+					P_Thing_SetVelocity(actor, args[1], args[2], args[3], !!args[4], !!args[5]);
                 }
             }
 			return 0;
diff --git a/src/p_local.h b/src/p_local.h
index e2d628e58..2332eb8db 100644
--- a/src/p_local.h
+++ b/src/p_local.h
@@ -139,7 +139,7 @@ bool	P_Thing_Projectile (int tid, AActor *source, int type, const char * type_na
 bool	P_MoveThing(AActor *source, fixed_t x, fixed_t y, fixed_t z, bool fog);
 bool	P_Thing_Move (int tid, AActor *source, int mapspot, bool fog);
 int		P_Thing_Damage (int tid, AActor *whofor0, int amount, FName type);
-void	P_Thing_SetVelocity(AActor *actor, fixed_t vx, fixed_t vy, fixed_t vz, bool add);
+void	P_Thing_SetVelocity(AActor *actor, fixed_t vx, fixed_t vy, fixed_t vz, bool add, bool setbob);
 void P_RemoveThing(AActor * actor);
 bool P_Thing_Raise(AActor *thing);
 
diff --git a/src/p_things.cpp b/src/p_things.cpp
index d09cba9ec..0b166cdc3 100644
--- a/src/p_things.cpp
+++ b/src/p_things.cpp
@@ -478,7 +478,7 @@ bool P_Thing_Raise(AActor *thing)
 	return true;
 }
 
-void P_Thing_SetVelocity(AActor *actor, fixed_t vx, fixed_t vy, fixed_t vz, bool add)
+void P_Thing_SetVelocity(AActor *actor, fixed_t vx, fixed_t vy, fixed_t vz, bool add, bool setbob)
 {
 	if (actor != NULL)
 	{
@@ -490,7 +490,7 @@ void P_Thing_SetVelocity(AActor *actor, fixed_t vx, fixed_t vy, fixed_t vz, bool
 		actor->velx += vx;
 		actor->vely += vy;
 		actor->velz += vz;
-		if (actor->player != NULL)
+		if (setbob && actor->player != NULL)
 		{
 			actor->player->velx += vx;
 			actor->player->vely += vy;