diff --git a/libs/openzap/src/ozmod/ozmod_isdn/ozmod_isdn.c b/libs/openzap/src/ozmod/ozmod_isdn/ozmod_isdn.c
index ea39bf4285..8aeecae8d3 100644
--- a/libs/openzap/src/ozmod/ozmod_isdn/ozmod_isdn.c
+++ b/libs/openzap/src/ozmod/ozmod_isdn/ozmod_isdn.c
@@ -399,7 +399,7 @@ static L3INT zap_isdn_931_34(void *pvt, L2UCHAR *msg, L2INT mlen)
 					zap_set_state_locked(zchan, ZAP_CHANNEL_STATE_RESTART);
 				} else {
 					uint32_t i;
-					for (i = 0; i < span->chan_count; i++) {
+					for (i = 1; i < span->chan_count; i++) {
 						zap_set_state_locked((span->channels[i]), ZAP_CHANNEL_STATE_RESTART);
 					}
 				}
diff --git a/libs/openzap/src/ozmod/ozmod_ss7_boost/ozmod_ss7_boost.c b/libs/openzap/src/ozmod/ozmod_ss7_boost/ozmod_ss7_boost.c
index c93f254783..ced303ca4c 100644
--- a/libs/openzap/src/ozmod/ozmod_ss7_boost/ozmod_ss7_boost.c
+++ b/libs/openzap/src/ozmod/ozmod_ss7_boost/ozmod_ss7_boost.c
@@ -142,7 +142,7 @@ static zap_channel_t *find_zchan(zap_span_t *span, ss7bc_short_event_t *event, i
 	zap_channel_t *zchan = NULL;
 
 	zap_mutex_lock(signal_mutex);
-	for(i = 0; i <= span->chan_count; i++) {
+	for(i = 1; i <= span->chan_count; i++) {
 		if (span->channels[i]->physical_span_id == event->span+1 && span->channels[i]->physical_chan_id == event->chan+1) {
 			zchan = span->channels[i];
 			if (force) {