diff --git a/sound.py b/sound.py
index c27ca36..be7cf28 100644
--- a/sound.py
+++ b/sound.py
@@ -29,7 +29,6 @@ class PCMStream:
         self.stream.start()
 
     def clean_up(self):
-        global noisegate_obj
         if self.stream is not None:
             self.stream.stop()
             self.stream.close()