diff --git a/media/libmediatranscoding/transcoder/benchmark/MediaTrackTranscoderBenchmark.cpp b/media/libmediatranscoding/transcoder/benchmark/MediaTrackTranscoderBenchmark.cpp
index c695ed9..aee0ed6 100644
--- a/media/libmediatranscoding/transcoder/benchmark/MediaTrackTranscoderBenchmark.cpp
+++ b/media/libmediatranscoding/transcoder/benchmark/MediaTrackTranscoderBenchmark.cpp
@@ -192,7 +192,7 @@
         auto& p = mSamples[mCurrentSampleIndex % mSamples.size()];
 
         if (bufferSize < p.second.size) return AMEDIA_ERROR_INVALID_PARAMETER;
-        memcpy(buffer, p.first.get(), bufferSize);
+        memcpy(buffer, p.first.get(), p.second.size);
 
         advanceTrack(trackIndex);
         return AMEDIA_OK;