diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index 72d59360ce..39b4559f43 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -4643,7 +4643,9 @@ static int update_call_counter(struct sip_pvt *fup, int event)
 			sip_pvt_lock(fup);
 			ast_mutex_lock(pu_lock);
 			if (ast_test_flag(&fup->flags[0], SIP_INC_RINGING)) {
-				(*inringing)--;
+				if (*inringing > 0) {
+					(*inringing)--;
+				}
 				ast_clear_flag(&fup->flags[0], SIP_INC_RINGING);
 			}
 			ast_mutex_unlock(pu_lock);