diff --git a/lib/index.js b/lib/index.js
index 41dd888..486a11e 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -7,7 +7,7 @@ function CssChunkHashPlugin(options) {
 CssChunkHashPlugin.prototype.createCssHash = function ({ assetsByChunkName, publicPath }) {
   return Object.keys(assetsByChunkName).reduce((hash, name) => {
     if (!assetsByChunkName[name] || !assetsByChunkName[name].find) return hash;
-    const file = assetsByChunkName[name].find(file => file.endsWith('.css'));
+    const file = assetsByChunkName[name].find(file => file.indexOf('.css') >= 0 && file.indexOf('.css.map') < 0);
     if (file) hash[name] = `${publicPath}${file}`;
     return hash;
   }, {});