diff --git a/src/index.js b/src/index.js
index aa4b2370..aa876e88 100644
--- a/src/index.js
+++ b/src/index.js
@@ -21,7 +21,7 @@ class UglifyJsPlugin {
 
     const {
       uglifyOptions = {},
-      test = /\.(js?)(\?.+)?$/i,
+      test = /\.js(\?.*)?$/i,
       warningsFilter = () => true,
       extractComments = false,
       sourceMap = false,