diff --git a/services/surfaceflinger/TransactionCallbackInvoker.h b/services/surfaceflinger/TransactionCallbackInvoker.h
index 3074795..245398f 100644
--- a/services/surfaceflinger/TransactionCallbackInvoker.h
+++ b/services/surfaceflinger/TransactionCallbackInvoker.h
@@ -56,6 +56,7 @@
     nsecs_t refreshStartTime = 0;
     nsecs_t dequeueReadyTime = 0;
     uint64_t frameNumber = 0;
+    uint64_t previousFrameNumber = 0;
     ReleaseCallbackId previousReleaseCallbackId = ReleaseCallbackId::INVALID_ID;
 };