diff --git a/call_manager.py b/call_manager.py
index 879f0af..0dcc335 100644
--- a/call_manager.py
+++ b/call_manager.py
@@ -67,8 +67,8 @@ class CallManager:
             print("Hang notify sent", "response=", response.decode())
             s.close()
 
-    def deaf_mumble():
+    def deaf_mumble(self):
         exec_mumble(True)
 
-    def undeaf_mumble():
+    def undeaf_mumble(self):
         exec_mumble(False)