diff --git a/mediapipe/framework/output_stream_shard.h b/mediapipe/framework/output_stream_shard.h
index fdc5fe07..718174c4 100644
--- a/mediapipe/framework/output_stream_shard.h
+++ b/mediapipe/framework/output_stream_shard.h
@@ -127,6 +127,8 @@ class OutputStreamShard : public OutputStream {
   friend class GraphProfiler;
   // Accesses OutputStreamShard for profiling.
   friend class GraphTracer;
+  // Accesses OutputStreamShard for profiling.
+  friend class PerfettoTraceScope;
   // Accesses OutputStreamShard for post processing.
   friend class OutputStreamManager;
 };