diff --git a/services/surfaceflinger/BufferStateLayer.h b/services/surfaceflinger/BufferStateLayer.h
index ea832a2..175a40b 100644
--- a/services/surfaceflinger/BufferStateLayer.h
+++ b/services/surfaceflinger/BufferStateLayer.h
@@ -124,6 +124,7 @@
 
 private:
     friend class SlotGenerationTest;
+    friend class TransactionFrameTracerTest;
     friend class TransactionSurfaceFrameTest;
 
     inline void tracePendingBufferCount();