diff --git a/src/modules/rtp_rtcp/source/rtcp_receiver_help.cc b/src/modules/rtp_rtcp/source/rtcp_receiver_help.cc
index 359851efac..0858d2b396 100644
--- a/src/modules/rtp_rtcp/source/rtcp_receiver_help.cc
+++ b/src/modules/rtp_rtcp/source/rtcp_receiver_help.cc
@@ -56,6 +56,11 @@ RTCPPacketInformation::AddApplicationData(const WebRtc_UWord8* data, const WebRt
     WebRtc_UWord8* oldData = applicationData;
     WebRtc_UWord16 oldLength = applicationLength;
 
+    // Don't copy more than kRtcpAppCode_DATA_SIZE bytes.
+    if (size > kRtcpAppCode_DATA_SIZE) {
+        size = kRtcpAppCode_DATA_SIZE;
+    }
+
     applicationLength += size;
     applicationData = new WebRtc_UWord8[applicationLength];