diff --git a/main/rtp_engine.c b/main/rtp_engine.c
index a827cfc875..962899b575 100644
--- a/main/rtp_engine.c
+++ b/main/rtp_engine.c
@@ -1947,8 +1947,8 @@ static struct ast_json *rtcp_report_to_json(struct stasis_message *msg,
 	if (payload->report->type == AST_RTP_RTCP_SR) {
 		char sec[32];
 		char usec[32];
-		snprintf(sec, sizeof(sec), "%ld", payload->report->sender_information.ntp_timestamp.tv_sec);
-		snprintf(usec, sizeof(usec), "%ld", payload->report->sender_information.ntp_timestamp.tv_usec);
+		snprintf(sec, sizeof(sec), "%lu", payload->report->sender_information.ntp_timestamp.tv_sec);
+		snprintf(usec, sizeof(usec), "%lu", payload->report->sender_information.ntp_timestamp.tv_usec);
 		json_rtcp_sender_info = ast_json_pack("{s: s, s: s, s: i, s: i, s: i}",
 				"ntp_timestamp_sec", sec,
 				"ntp_timestamp_usec", usec,