1 files changed, 1 insertions, 1 deletions

diff --git a/arch-nspawn.in b/arch-nspawn.in
index e46b57f..2b17f11 100644
--- a/arch-nspawn.in
+++ b/arch-nspawn.in
@@ -34,7 +34,7 @@ while getopts 'hC:M:c:' arg; do
 		M) makepkg_conf="$OPTARG" ;;
 		c) cache_dir="$OPTARG" ;;
 		h|?) usage ;;
-		*) error "invalid argument '$arg'"; usage ;;
+		*) error "invalid argument '%s'" "$arg"; usage ;;
 	esac
 done
 shift $(($OPTIND - 1))