diff --git a/thin_check.cc b/thin_check.cc
index e8eac42..9db11bb 100644
--- a/thin_check.cc
+++ b/thin_check.cc
@@ -90,5 +90,5 @@ int main(int argc, char **argv)
 		exit(1);
 	}
 
-	return check(argv[1], quiet);
+	return check(argv[optind], quiet);
 }
diff --git a/thin_repair.cc b/thin_repair.cc
index 22b8ea1..43c62e4 100644
--- a/thin_repair.cc
+++ b/thin_repair.cc
@@ -75,5 +75,5 @@ int main(int argc, char **argv)
 		exit(1);
 	}
 
-	return check(argv[1]);
+	return check(argv[optind]);
 }