diff --git a/lib/system/has-flag.js b/lib/system/has-flag.js
index 6097003..df0f8c9 100644
--- a/lib/system/has-flag.js
+++ b/lib/system/has-flag.js
@@ -11,12 +11,11 @@ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLI
 */
 
 'use strict';
+
 module.exports = function (flag, argv) {
 	argv = argv || process.argv;
-
-	var terminatorPos = argv.indexOf('--');
-	var prefix = /^-{1,2}/.test(flag) ? '' : '--';
+	var prefix = flag.startsWith('-') ? '' : flag.length === 1 ? '-' : '--';
 	var pos = argv.indexOf(prefix + flag);
-
+	var terminatorPos = argv.indexOf('--');
 	return pos !== -1 && (terminatorPos === -1 ? true : pos < terminatorPos);
 };