diff --git a/addon/ng2/blueprints/ng2/files/karma-test-shim.js b/addon/ng2/blueprints/ng2/files/karma-test-shim.js
index 0402b3394263..126a1dc555e9 100644
--- a/addon/ng2/blueprints/ng2/files/karma-test-shim.js
+++ b/addon/ng2/blueprints/ng2/files/karma-test-shim.js
@@ -37,9 +37,9 @@ System.import('angular2/src/core/dom/browser_adapter').then(function(browser_ada
 });
 
 function onlyAppFiles(filePath) {
-  return /^\/base\/dist\/app\/(?!spec)([a-z0-9]+)\.js$/.test(filePath);
+  return /^\/base\/dist\/app\/(?!spec)([a-z0-9-_]+)\.js$/.test(filePath);
 }
 
 function onlySpecFiles(path) {
   return /\.spec\.js$/.test(path);
-}
\ No newline at end of file
+}