diff --git a/webrtc/modules/video_coding/main/source/generic_encoder.cc b/webrtc/modules/video_coding/main/source/generic_encoder.cc
index 336b997e3..d01fbf4f5 100644
--- a/webrtc/modules/video_coding/main/source/generic_encoder.cc
+++ b/webrtc/modules/video_coding/main/source/generic_encoder.cc
@@ -226,6 +226,7 @@ int32_t VCMEncodedFrameCallback::Encoded(
 #endif
 
   RTPVideoHeader rtpVideoHeader;
+  memset(&rtpVideoHeader, 0, sizeof(RTPVideoHeader));
   RTPVideoHeader* rtpVideoHeaderPtr = &rtpVideoHeader;
   CopyCodecSpecific(codecSpecificInfo, &rtpVideoHeaderPtr);