diff --git a/openbsc/src/libtrau/rtp_proxy.c b/openbsc/src/libtrau/rtp_proxy.c
index 122daf2..1567323 100644
--- a/openbsc/src/libtrau/rtp_proxy.c
+++ b/openbsc/src/libtrau/rtp_proxy.c
@@ -374,7 +374,7 @@
 			tag = *cur++;
 			if (tag == 0) {
 				/* end of chunk, skip additional zero */
-				while (*cur++ == 0) { }
+				while ((*cur++ == 0) && (cur < rtcp_end)) { }
 				break;
 			}
 			len = *cur++;