diff --git a/spleeter/separator.py b/spleeter/separator.py
index 50e3984..f2925e8 100644
--- a/spleeter/separator.py
+++ b/spleeter/separator.py
@@ -304,7 +304,7 @@ class Separator(object):
 
     def separate(
         self, waveform: np.ndarray, audio_descriptor: Optional[str] = ""
-    ) -> None:
+    ) -> Dict:
         """
         Performs separation on a waveform.