diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index d2a297f177..19dc9f833b 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -6558,7 +6558,7 @@ static int process_sdp(struct sip_pvt *p, struct sip_request *req, int t38action
 		ast_log(LOG_WARNING, "SDP sytax error in o= line\n");
 		return -1;
 	}
-	if (!sscanf(token, "%lu", &rua_version)) {
+	if (!sscanf(token, "%llu", (unsigned long long *) &rua_version)) {
 		ast_log(LOG_WARNING, "SDP sytax error in o= line version\n");
 		return -1;
 	}