diff --git a/src/p_actionfunctions.cpp b/src/p_actionfunctions.cpp
index c6a6b20f4..1a3333bdd 100644
--- a/src/p_actionfunctions.cpp
+++ b/src/p_actionfunctions.cpp
@@ -988,13 +988,6 @@ DEFINE_ACTION_FUNCTION(AActor, A_SoundVolume)
 	return 0;
 }
 
-DEFINE_ACTION_FUNCTION(AActor, A_IsPlayingSound)
-{
-	PARAM_SELF_PROLOGUE(AActor);
-	PARAM_INT(channel);
-	PARAM_SOUND(sound);
-	ACTION_RETURN_BOOL(S_IsActorPlayingSomething(self,channel,sound));
-}
 
 //==========================================================================
 //
diff --git a/wadsrc/static/zscript/actor.txt b/wadsrc/static/zscript/actor.txt
index 1dde57937..4d61435a6 100644
--- a/wadsrc/static/zscript/actor.txt
+++ b/wadsrc/static/zscript/actor.txt
@@ -1010,7 +1010,6 @@ class Actor : Thinker native
 	native void A_StopSound(int slot = CHAN_VOICE);	// Bad default but that's what is originally was...
 	deprecated("2.3") native void A_PlaySoundEx(sound whattoplay, name slot, bool looping = false, int attenuation = 0);
 	deprecated("2.3") native void A_StopSoundEx(name slot);
-	native ui bool A_IsPlayingSound(int channel = 0, sound sound_id = "");
 	native void A_SeekerMissile(int threshold, int turnmax, int flags = 0, int chance = 50, int distance = 10);
 	native action state A_Jump(int chance, statelabel label, ...);
 	native Actor A_SpawnProjectile(class<Actor> missiletype, double spawnheight = 32, double spawnofs_xy = 0, double angle = 0, int flags = 0, double pitch = 0, int ptr = AAPTR_TARGET);