diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index 458605b091..156888bbce 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -3004,7 +3004,7 @@ static int __sip_semi_ack(struct sip_pvt *p, int seqno, int resp, int sipmethod)
 			break;
 		}
 	}
-	ast_debug(1, "(Provisional) Stopping retransmission (but retaining packet) on '%s' %s %d: %s\n", p->callid, resp ? "Response" : "Request", seqno, res ? "Not Found" : "Found");
+	ast_debug(1, "(Provisional) Stopping retransmission (but retaining packet) on '%s' %s %d: %s\n", p->callid, resp ? "Response" : "Request", seqno, res == -1 ? "Not Found" : "Found");
 	return res;
 }