diff --git a/src/index.ts b/src/index.ts
index 90f6e06d..fa7d85f5 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -197,7 +197,7 @@ function createLoaderRules(languages: IFeatureDefinition[], features: IFeatureDe
         getWorkerUrl: function (moduleId, label) {
           var pathPrefix = ${pathPrefix};
           var result = (pathPrefix ? stripTrailingSlash(pathPrefix) + '/' : '') + paths[label];
-          if (/^(http:)|(https:)|(file:)/.test(result)) {
+          if (/^((http:)|(https:)|(file:)|(\/\/))/.test(result)) {
             var currentUrl = String(window.location);
             var currentOrigin = currentUrl.substr(0, currentUrl.length - window.location.hash.length - window.location.search.length - window.location.pathname.length);
             if (result.substring(0, currentOrigin.length) !== currentOrigin) {