diff --git a/src/barebox-state.c b/src/barebox-state.c
index 24e13d2..e68b8cb 100644
--- a/src/barebox-state.c
+++ b/src/barebox-state.c
@@ -499,6 +499,11 @@
 		}
 	}
 
+	if (optind < argc) {
+		pr_err("Invalid argument: %s\n", argv[optind]);
+		exit(1);
+	}
+
 	pr_level_set(pr_level);
 
 	if (nr_states == 0) {