diff --git a/Shared/lib/python3.4/site-packages/zeroconf.py b/Shared/lib/python3.4/site-packages/zeroconf.py
index 2d67563..6d7078c 100644
--- a/Shared/lib/python3.4/site-packages/zeroconf.py
+++ b/Shared/lib/python3.4/site-packages/zeroconf.py
@@ -971,10 +971,11 @@ class ServiceBrowser(threading.Thread):
 
         self.done = False
 
+        self._service_state_changed = Signal()
+
         self.zc.add_listener(self, DNSQuestion(self.type, _TYPE_PTR, _CLASS_IN))
         self.start()
 
-        self._service_state_changed = Signal()
 
         if hasattr(handlers, 'add_service'):
             listener = handlers