diff --git a/src/playsim/p_things.cpp b/src/playsim/p_things.cpp
index 12d685952b..c818fb6182 100644
--- a/src/playsim/p_things.cpp
+++ b/src/playsim/p_things.cpp
@@ -171,7 +171,7 @@ void InterceptDefaultAim(AActor *mobj, AActor *targ, DVector3 aim, double speed)
 
 // [MC] Was part of P_Thing_Projectile, now its own function for use in ZScript.
 // Aims mobj at targ based on speed and targ's velocity.
-static void VelIntercept(AActor *targ, AActor *mobj, double speed, bool aimpitch = false, bool oldvel = false, bool leadtarget = true)
+static void VelIntercept(AActor *targ, AActor *mobj, double speed, bool aimpitch = false, bool oldvel = false, bool resetvel = false, bool leadtarget = true)
 {
 	if (targ == nullptr || mobj == nullptr)	return;
 
@@ -199,7 +199,7 @@ static void VelIntercept(AActor *targ, AActor *mobj, double speed, bool aimpitch
 			if (targ->Vel.X == 0 && targ->Vel.Y == 0)
 			{
 				InterceptDefaultAim(mobj, targ, aim, speed);
-				if (oldvel)
+				if (resetvel)
 				{
 					mobj->Vel = prevel;
 				}
@@ -225,6 +225,10 @@ static void VelIntercept(AActor *targ, AActor *mobj, double speed, bool aimpitch
 		// And make the projectile follow that vector at the desired speed.
 		mobj->Vel = aimvec * (speed / dist);
 		mobj->AngleFromVel();
+		if (oldvel)
+		{
+			mobj->Vel = prevel;
+		}
 		if (aimpitch) // [MC] Ripped right out of A_FaceMovementDirection
 		{
 			const DVector2 velocity = mobj->Vel.XY();
@@ -235,7 +239,7 @@ static void VelIntercept(AActor *targ, AActor *mobj, double speed, bool aimpitch
 	{
 		InterceptDefaultAim(mobj, targ, aim, speed);
 	}
-	if (oldvel)
+	if (resetvel)
 	{
 		mobj->Vel = prevel;
 	}
@@ -248,8 +252,9 @@ DEFINE_ACTION_FUNCTION(AActor, VelIntercept)
 	PARAM_FLOAT(speed);
 	PARAM_BOOL(aimpitch);
 	PARAM_BOOL(oldvel);
+	PARAM_BOOL(resetvel);
 	if (speed < 0)	speed = self->Speed;
-	VelIntercept(targ, self, speed, aimpitch, oldvel);
+	VelIntercept(targ, self, speed, aimpitch, oldvel, resetvel);
 	return 0;
 }
 
@@ -335,7 +340,7 @@ bool FLevelLocals::EV_Thing_Projectile (int tid, AActor *source, int type, const
 
 					if (targ != nullptr)
 					{
-						VelIntercept(targ, mobj, speed, false, false, leadTarget);
+						VelIntercept(targ, mobj, speed, false, false, false, leadTarget);
 
 						if (mobj->flags2 & MF2_SEEKERMISSILE)
 						{
diff --git a/wadsrc/static/zscript/actors/actor.zs b/wadsrc/static/zscript/actors/actor.zs
index 3abfbaabe2..e336b70ceb 100644
--- a/wadsrc/static/zscript/actors/actor.zs
+++ b/wadsrc/static/zscript/actors/actor.zs
@@ -751,7 +751,7 @@ class Actor : Thinker native
 	native clearscope vector2 Vec2Angle(double length, double angle, bool absolute = false) const;
 	native clearscope vector2 Vec2Offset(double x, double y, bool absolute = false) const;
 	native clearscope vector3 Vec2OffsetZ(double x, double y, double atz, bool absolute = false) const;
-	native void VelIntercept(Actor targ, double speed = -1, bool aimpitch = true, bool oldvel = false);
+	native void VelIntercept(Actor targ, double speed = -1, bool aimpitch = true, bool oldvel = false, bool resetvel = false);
 	native void VelFromAngle(double speed = 1e37, double angle = 1e37);
 	native void Vel3DFromAngle(double speed, double angle, double pitch);
 	native void Thrust(double speed = 1e37, double angle = 1e37);