1 files changed, 3 insertions, 0 deletions
diff --git a/tests/module_api/test_api.py b/tests/module_api/test_api.py
index 9919938e80..8f88c0117d 100644
--- a/tests/module_api/test_api.py
+++ b/tests/module_api/test_api.py
@@ -404,6 +404,9 @@ class ModuleApiTestCase(HomeserverTestCase):
             self.module_api.send_local_online_presence_to([remote_user_id])
         )
 
+        # We don't always send out federation immediately, so we advance the clock.
+        self.reactor.advance(1000)
+
         # Check that a presence update was sent as part of a federation transaction
         found_update = False
         calls = (