diff --git a/src/loader.js b/src/loader.js
index a91dd787..07d1a8ed 100644
--- a/src/loader.js
+++ b/src/loader.js
@@ -181,7 +181,7 @@ export function pitch(request) {
       return callback(e);
     }
 
-    let resultSource = `// extracted by ${pluginName}`;
+    let resultSource = `/* extracted by ${pluginName}*/`;
     const result = locals
       ? `\nmodule.exports = ${JSON.stringify(locals)};`
       : '';
diff --git a/test/cases/hmr/expected/main.js b/test/cases/hmr/expected/main.js
index 0b125150..ef2d42f3 100644
--- a/test/cases/hmr/expected/main.js
+++ b/test/cases/hmr/expected/main.js
@@ -88,9 +88,9 @@
 /* 0 */
 /***/ (function(module, exports, __webpack_require__) {
 
-// extracted by mini-css-extract-plugin
+/* extracted by mini-css-extract-plugin*/
     if(false) { var cssReload; }
   
 
 /***/ })
-/******/ ]);
\ No newline at end of file
+/******/ ]);