diff --git a/services/surfaceflinger/Scheduler/Scheduler.h b/services/surfaceflinger/Scheduler/Scheduler.h
index 10ffc7a..7b5278c 100644
--- a/services/surfaceflinger/Scheduler/Scheduler.h
+++ b/services/surfaceflinger/Scheduler/Scheduler.h
@@ -144,6 +144,8 @@
             impl::EventThread::InterceptVSyncsCallback interceptCallback);
 
 private:
+    friend class TestableScheduler;
+
     // Creates a connection on the given EventThread and forwards the given callbacks.
     sp<EventThreadConnection> createConnectionInternal(EventThread*, ResyncCallback&&);