diff --git a/src/thingdef/thingdef_codeptr.cpp b/src/thingdef/thingdef_codeptr.cpp
index 7e89c8b70..d801a7e80 100644
--- a/src/thingdef/thingdef_codeptr.cpp
+++ b/src/thingdef/thingdef_codeptr.cpp
@@ -3379,7 +3379,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_CheckCeiling)
 //===========================================================================
 DEFINE_ACTION_FUNCTION(AActor, A_Stop)
 {
-	PARAM_SELF_PROLOGUE(AActor);
+	PARAM_ACTION_PROLOGUE;
 	self->Vel.Zero();
 	if (self->player && self->player->mo == self && !(self->player->cheats & CF_PREDICTING))
 	{
diff --git a/wadsrc/static/actors/actor.txt b/wadsrc/static/actors/actor.txt
index 1355fd7a8..fc51c6d5c 100644
--- a/wadsrc/static/actors/actor.txt
+++ b/wadsrc/static/actors/actor.txt
@@ -244,7 +244,7 @@ ACTOR Actor native //: Thinker
 	action native A_Blast(int flags = 0, float strength = 255, float radius = 255, float speed = 20, class<Actor> blasteffect = "BlastEffect", sound blastsound = "BlastRadius");
 	action native A_RadiusThrust(int force = 128, int distance = -1, int flags = RTF_AFFECTSOURCE, int fullthrustdistance = 0);
 	action native A_Explode(int damage = -1, int distance = -1, int flags = XF_HURTSOURCE, bool alert = false, int fulldamagedistance = 0, int nails = 0, int naildamage = 10, class<Actor> pufftype = "BulletPuff");
-	native void A_Stop();
+	action native A_Stop();
 	action native A_Respawn(int flags = 1);
 	action native A_BarrelDestroy();
 	action native A_QueueCorpse();