diff --git a/sauvegarde_mysql.sh b/sauvegarde_mysql.sh
index 8153cd1..a576f21 100755
--- a/sauvegarde_mysql.sh
+++ b/sauvegarde_mysql.sh
@@ -86,6 +86,11 @@ while getopts hd:B:p:ze:x:X: f; do
 			MYSQLDUMP_EXTRA_ARGS="$OPTARG"
 			;;
 
+		\?)
+			usage
+			exit 1
+			;;
+
 	esac
 done
 shift $( expr $OPTIND - 1 )