diff --git a/webrtc/modules/rtp_rtcp/source/rtcp_packet/extended_reports.h b/webrtc/modules/rtp_rtcp/source/rtcp_packet/extended_reports.h
index 21fadd8338..09723ef949 100644
--- a/webrtc/modules/rtp_rtcp/source/rtcp_packet/extended_reports.h
+++ b/webrtc/modules/rtp_rtcp/source/rtcp_packet/extended_reports.h
@@ -48,7 +48,7 @@ class ExtendedReports : public RtcpPacket {
   const rtc::Optional<VoipMetric>& voip_metric() const {
     return voip_metric_block_;
   }
-  const rtc::Optional<TargetBitrate>& target_bitrate() {
+  const rtc::Optional<TargetBitrate>& target_bitrate() const {
     return target_bitrate_;
   }