diff --git a/src/scripting/vmthunks_actors.cpp b/src/scripting/vmthunks_actors.cpp
index cb9c7ab0521..b257212e84d 100644
--- a/src/scripting/vmthunks_actors.cpp
+++ b/src/scripting/vmthunks_actors.cpp
@@ -1688,7 +1688,7 @@ static int isFrozen(AActor *self)
 DEFINE_ACTION_FUNCTION_NATIVE(AActor, isFrozen, isFrozen)
 {
 	PARAM_SELF_PROLOGUE(AActor);
-	return isFrozen(self);
+	ACTION_RETURN_BOOL(isFrozen(self));
 }