diff --git a/source/funkin/audio/FunkinSound.hx b/source/funkin/audio/FunkinSound.hx
index 8d2ad9a32..a0175ad4d 100644
--- a/source/funkin/audio/FunkinSound.hx
+++ b/source/funkin/audio/FunkinSound.hx
@@ -535,9 +535,9 @@ class FunkinSound extends FlxSound implements ICloneable<FunkinSound>
    * @param volume
    * @return A `FunkinSound` object, or `null` if the sound could not be loaded.
    */
-  public static function playOnce(key:String, volume:Float = 1.0, ?onComplete:Void->Void, ?onLoad:Void->Void):FunkinSound
+  public static function playOnce(key:String, volume:Float = 1.0, ?onComplete:Void->Void, ?onLoad:Void->Void):Null<FunkinSound>
   {
-    var result = FunkinSound.load(key, volume, false, true, true, onComplete, onLoad);
+    var result:Null<FunkinSound> = FunkinSound.load(key, volume, false, true, true, onComplete, onLoad);
     return result;
   }