@@ -84,8 +84,8 @@ module.exports = function(args, opts) {
 	const out = { _: [] };
 
 	while (args[idx] !== void 0) {
-		const val = args[idx];
 		let incr = 1;
+		const val = args[idx];
 
 		if (val === '--') {
 			out._ = out._.concat(args.slice(idx + 1));
@@ -103,6 +103,10 @@ module.exports = function(args, opts) {
 			len = flag.length;
 			const key = isGroup ? flag[len - 1] : flag;
 
+			if (opts.unknown !== void 0 && aliases[key] === void 0) {
+				return opts.unknown(segs[0]);
+			}
+
 			if (segs.length > 1) {
 				tmp = segs[1];
 			} else {