diff --git a/src/thingdef/thingdef_codeptr.cpp b/src/thingdef/thingdef_codeptr.cpp
index add3a5b7dd..13d2739d3a 100644
--- a/src/thingdef/thingdef_codeptr.cpp
+++ b/src/thingdef/thingdef_codeptr.cpp
@@ -4203,14 +4203,15 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_Warp)
 
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, ACS_NamedExecuteWithResult)
 {
-	ACTION_PARAM_START(4);
+	ACTION_PARAM_START(5);
 
 	ACTION_PARAM_NAME(scriptname, 0);
 	ACTION_PARAM_INT(arg1, 1);
 	ACTION_PARAM_INT(arg2, 2);
 	ACTION_PARAM_INT(arg3, 3);
+	ACTION_PARAM_INT(arg4, 4);
 
-	bool res = !!P_ExecuteSpecial(ACS_ExecuteWithResult, NULL, self, false, -scriptname, arg1, arg2, arg3, 0);
+	bool res = !!P_ExecuteSpecial(ACS_ExecuteWithResult, NULL, self, false, -scriptname, arg1, arg2, arg3, arg4);
 
 	ACTION_SET_RESULT(res);
 }