diff --git a/services/surfaceflinger/SurfaceFlinger.h b/services/surfaceflinger/SurfaceFlinger.h
index 7d23c3c..ee47032 100644
--- a/services/surfaceflinger/SurfaceFlinger.h
+++ b/services/surfaceflinger/SurfaceFlinger.h
@@ -1416,6 +1416,8 @@
         bool early = false;
     } mPowerHintSessionMode;
 
+    void startPowerHintSession() const;
+
     nsecs_t mAnimationTransactionTimeout = s2ns(5);
 
     friend class SurfaceComposerAIDL;