diff --git a/platypush/backend/__init__.py b/platypush/backend/__init__.py
index 1aaa339c..9c78e928 100644
--- a/platypush/backend/__init__.py
+++ b/platypush/backend/__init__.py
@@ -372,7 +372,7 @@ class Backend(Thread, EventGenerator):
                 self.bus.post(ZeroconfServiceRemovedEvent(service_type=self.zeroconf_info.type,
                                                           service_name=self.zeroconf_info.name))
             else:
-                self.bus.post(ZeroconfServiceRemovedEvent())
+                self.bus.post(ZeroconfServiceRemovedEvent(service_type=None, service_name=None))
 
             self.zeroconf_info = None
             self.zeroconf = None