diff --git a/voice_recognition.py b/voice_recognition.py
index 00eb40b..8c0b5fd 100644
--- a/voice_recognition.py
+++ b/voice_recognition.py
@@ -110,7 +110,7 @@ class SRBuffer(voice_recv.AudioSink):
         self.wavewriter.pop(username)
 
     def rotate_user(self,username):
-        self.wavewriter[username].rotate()
+        self.wavewriter[str(username)].rotate()
 
     def wants_opus(self) -> bool:
         return False