diff --git a/tests/msc3902/federation_room_join_partial_state_test.go b/tests/msc3902/federation_room_join_partial_state_test.go
index 8534bcea..1ef5f612 100644
--- a/tests/msc3902/federation_room_join_partial_state_test.go
+++ b/tests/msc3902/federation_room_join_partial_state_test.go
@@ -1499,7 +1499,7 @@ func TestPartialStateJoin(t *testing.T) {
 		// instead let's just check for the presence of the room in the timeline.
 		// it can take a while for the homeserver to update its state for 100+ events, so raise
 		// the default timeout.
-		alice.SyncUntilTimeout = 20 * time.Second
+		alice.SyncUntilTimeout = 30 * time.Second
 		alice.MustSyncUntil(t,
 			client.SyncReq{},
 			func(clientUserID string, topLevelSyncJSON gjson.Result) error {