diff --git a/luci-app-openmptcprouter/root/etc/init.d/openmptcprouter b/luci-app-openmptcprouter/root/etc/init.d/openmptcprouter
index 6a667e263..189f2669b 100755
--- a/luci-app-openmptcprouter/root/etc/init.d/openmptcprouter
+++ b/luci-app-openmptcprouter/root/etc/init.d/openmptcprouter
@@ -189,6 +189,7 @@ start_service() {
 			commit firewall
 		EOF
 		rmmod nf_nat_sip 2>&1 >/dev/null
+		sleep 2
 		rmmod nf_conntrack_sip 2>&1 >/dev/null
 	else
 		uci -q batch <<-EOF >/dev/null
@@ -198,6 +199,7 @@ start_service() {
 			commit firewall
 		EOF
 		modprobe -q nf_conntrack_sip 2>&1 >/dev/null
+		sleep 2
 		modprobe -q nf_nat_sip 2>&1 >/dev/null
 	fi