diff --git a/services/surfaceflinger/FrameTimeline/FrameTimeline.cpp b/services/surfaceflinger/FrameTimeline/FrameTimeline.cpp
index 3523b56..c294ff2 100644
--- a/services/surfaceflinger/FrameTimeline/FrameTimeline.cpp
+++ b/services/surfaceflinger/FrameTimeline/FrameTimeline.cpp
@@ -693,6 +693,7 @@
         actualSurfaceFrameStartEvent->set_gpu_composition(mGpuComposition);
         actualSurfaceFrameStartEvent->set_jank_type(jankTypeBitmaskToProto(mJankType));
         actualSurfaceFrameStartEvent->set_prediction_type(toProto(mPredictionState));
+        actualSurfaceFrameStartEvent->set_is_buffer(mIsBuffer);
     });
 
     // Actual timeline end