diff --git a/app/music.py b/app/music.py
index 986ba26..c428d5e 100644
--- a/app/music.py
+++ b/app/music.py
@@ -24,7 +24,7 @@ class FadeTrack(QRunnable):
         self.player = player
         self.fade_seconds = fade_seconds
 
-    def run(self):
+    def run(self) -> None:
         """
         Implementation of fading the player
         """