diff --git a/dmount b/dmount
index fa57a8e..7ba7011 100755
--- a/dmount
+++ b/dmount
@@ -92,5 +92,9 @@ for i in "$@"; do
             umount_lvm_on_luks
             exit 0
             ;;
+        *)
+            echo "Error, uknown args $i" >&2
+            exit 1
+            ;;
     esac
 done