diff --git a/webrtc/modules/rtp_rtcp/source/rtp_format_vp8.cc b/webrtc/modules/rtp_rtcp/source/rtp_format_vp8.cc
index 57ff74fe26..5202754caf 100644
--- a/webrtc/modules/rtp_rtcp/source/rtp_format_vp8.cc
+++ b/webrtc/modules/rtp_rtcp/source/rtp_format_vp8.cc
@@ -678,6 +678,7 @@ bool RtpDepacketizerVp8::Parse(ParsedPayload* parsed_payload,
   parsed_payload->type.Video.height = 0;
   parsed_payload->type.Video.isFirstPacket =
       beginning_of_partition && (partition_id == 0);
+  parsed_payload->type.Video.simulcastIdx = 0;
   parsed_payload->type.Video.codec = kRtpVideoVp8;
   parsed_payload->type.Video.codecHeader.VP8.nonReference =
       (*payload_data & 0x20) ? true : false;  // N bit