diff --git a/tools/utils.js b/tools/utils.js
index e801beaae1..2fac0dcce4 100644
--- a/tools/utils.js
+++ b/tools/utils.js
@@ -228,7 +228,7 @@ exports.timeoutScaleFactor = timeoutScaleFactor;
 // the prerelease for a given release will sort before it. Because $ sorts
 // before '.', this means that 1.2 will sort before 1.2.3.)
 exports.defaultOrderKeyForReleaseVersion = function (v) {
-  var m = v.match(/^(\d{1,4}(?:\.\d{1,4})*)(?:-([-A-za-z]{1,15})(\d{0,4}))?$/);
+  var m = v.match(/^(\d{1,4}(?:\.\d{1,4})*)(?:-([-A-Za-z]{1,15})(\d{0,4}))?$/);
   if (!m)
     return null;
   var numberPart = m[1];