diff --git a/cfg_checker/cfg_check.py b/cfg_checker/cfg_check.py
index 37f9957..1a2d79f 100644
--- a/cfg_checker/cfg_check.py
+++ b/cfg_checker/cfg_check.py
@@ -44,11 +44,19 @@
 
     # parse arguments
     try:
-        args = parser.parse_args()
+        args, unknown = parser.parse_known_args()
     except TypeError:
         logger_cli.info("\n# Please, check arguments")
         sys.exit(0)
 
+    if unknown:
+        logger_cli.error(
+            "# Unexpected arguments: {}".format(
+                ", ".join(["'{}'".format(a) for a in unknown])
+            )
+        )
+        sys.exit(1)
+
     # Pass externally configured values
     config.ssh_uses_sudo = args.sudo