diff --git a/rootfs/usr/local/etc/docker/init.d/zz-ifconfig.sh b/rootfs/usr/local/etc/docker/init.d/zz-ifconfig.sh
index 99eeeae..971a207 100755
--- a/rootfs/usr/local/etc/docker/init.d/zz-ifconfig.sh
+++ b/rootfs/usr/local/etc/docker/init.d/zz-ifconfig.sh
@@ -121,7 +121,7 @@ SERVICE_GID="0" # set the group id
 # execute command variables - keep single quotes variables will be expanded later
 EXEC_CMD_BIN='ifconfig'                                      # command to execute
 EXEC_CMD_ARGS='-r -s -p '                                    # command arguments
-EXEC_CMD_ARGS='-l :$SERVICE_PORT '                           # command arguments
+EXEC_CMD_ARGS+='-l :$SERVICE_PORT '                          # command arguments
 EXEC_CMD_ARGS+='-H X-Real-IP '                               # command arguments
 EXEC_CMD_ARGS+='-H x-forwarded-for '                         # command arguments
 EXEC_CMD_ARGS+='-a /opt/echoip/geoip/GeoLite2-ASN.mmdb '     # command arguments