diff --git a/package/netifd/files/lib/netifd/proto/dhcp.sh b/package/netifd/files/lib/netifd/proto/dhcp.sh
index 3365cb7ae..9182d58ad 100755
--- a/package/netifd/files/lib/netifd/proto/dhcp.sh
+++ b/package/netifd/files/lib/netifd/proto/dhcp.sh
@@ -35,7 +35,7 @@ proto_dhcp_setup() {
 		-f -t 0 -i "$iface" \
 		${ipaddr:+-r $ipaddr} \
 		${hostname:+-H $hostname} \
-		${clientid:+-c $clientid} \
+		${clientid:+-x 0x3d:${clientid//:/}} \
 		${vendorid:+-V $vendorid} \
 		$broadcast $dhcpopts
 }