diff --git a/sync3/conn_test.go b/sync3/conn_test.go
index 8b148ea..ee6f330 100644
--- a/sync3/conn_test.go
+++ b/sync3/conn_test.go
@@ -26,6 +26,7 @@ func (c *connHandlerMock) Destroy()                                           {}
 func (c *connHandlerMock) Alive() bool                                        { return true }
 func (c *connHandlerMock) OnUpdate(ctx context.Context, update caches.Update) {}
 func (c *connHandlerMock) PublishEventsUpTo(roomID string, nid int64)         {}
+func (c *connHandlerMock) SetCancelCallback(cancel context.CancelFunc)        {}
 
 // Test that Conn can send and receive requests based on positions
 func TestConn(t *testing.T) {