diff --git a/modules/rtpproxy/rtpproxy.c b/modules/rtpproxy/rtpproxy.c
index 3f7c7af5b..f28876555 100644
--- a/modules/rtpproxy/rtpproxy.c
+++ b/modules/rtpproxy/rtpproxy.c
@@ -2217,6 +2217,9 @@ force_rtp_proxy(struct sip_msg* msg, char* str1, char* str2, int offer, int forc
 					LM_ERR("out of pkg memory\n");
 					FORCE_RTP_PROXY_RET (-1);
 				}
+				/* We need to update the pointers and the length here, it has changed. */
+				v[1].iov_base = opts.s.s;
+				v[1].iov_len = opts.oidx;
 			}
 			STR2IOVEC(newip, v[9]);
 			STR2IOVEC(oldport, v[11]);