diff --git a/hello/discoverer.py b/hello/discoverer.py
index d79561f..f2f0d22 100644
--- a/hello/discoverer.py
+++ b/hello/discoverer.py
@@ -142,7 +142,7 @@ def _create_event(self, group: Group, matcher: ServiceMatcher, stored: Service |
                 return DiscoveryEvent(group, matcher.query, service, DiscoveryEventType.UPDATED)
             else:
                 log.debug('Service unchanged', group=group, service=service)
-                return DiscoveryEvent(group, matcher.query, service, DiscoveryEventType.UPDATED)
+                return DiscoveryEvent(group, matcher.query, service, DiscoveryEventType.UNCHANGED)
         else:
             log.info('Service discovered', group=group, service=service)
             return DiscoveryEvent(group, matcher.query, service, DiscoveryEventType.DISCOVERED)
diff --git a/tests/defaultDiscovererTest.py b/tests/defaultDiscovererTest.py
index 34e1a66..7839e90 100644
--- a/tests/defaultDiscovererTest.py
+++ b/tests/defaultDiscovererTest.py
@@ -9,7 +9,6 @@
 from hello import Service, Group, ServiceQuery, DefaultDiscoverer, Sender, Receiver, OnDiscoveryEvent, \
     DiscoveryEventType, DiscoveryEvent
 
-
 GROUP = Group('test-group', 'udp://239.0.0.1:5555')
 SERVICE_QUERY = ServiceQuery('test-.*', 'test-.*')
 SERVICE = Service(
@@ -185,7 +184,7 @@ def test_does_not_call_handler_when_service_not_changed(self):
         discoverer = DefaultDiscoverer(sender, receiver)
         discoverer.start(GROUP, SERVICE_QUERY)
         handler = MagicMock(spec=OnDiscoveryEvent)
-        discoverer.register(handler)
+        discoverer.register(handler, {DiscoveryEventType.DISCOVERED, DiscoveryEventType.UPDATED})
         discoverer._handle_message(SERVICE.to_dict())
         handler.reset_mock()
 
@@ -193,7 +192,8 @@ def test_does_not_call_handler_when_service_not_changed(self):
         discoverer._handle_message(SERVICE.to_dict())
 
         # Then
-        handler.assert_not_called()
+        with self.assertRaises(AssertionError):
+            wait_for_assertion(0.1, lambda: handler.assert_called())
 
     def test_handles_handler_error_gracefully(self):
         # Given