diff --git a/package/network/utils/comgt/files/3g.usb b/package/network/utils/comgt/files/3g.usb
index 8f0d62ca83..9c7d07a0e6 100644
--- a/package/network/utils/comgt/files/3g.usb
+++ b/package/network/utils/comgt/files/3g.usb
@@ -23,6 +23,8 @@ find_3g_iface() {
 	fi
 }
 
+[ "$ACTION" = add ] || [ "$ACTION" = remove ] || exit 0
+
 case "$DEVICENAME" in
 	tty*)
 		[ -e "/dev/$DEVICENAME" ] || [ "$ACTION" = remove ] || exit 0