diff --git a/lib/build.js b/lib/build.js
index 79e691a0..0fb3c5cb 100644
--- a/lib/build.js
+++ b/lib/build.js
@@ -75,7 +75,7 @@ function webpackConfig(dir, additionalConfig) {
   };
   fs.readdirSync(dirPath).forEach(function(file) {
     if (file.match(/\.(m?js|ts)$/)) {
-      var name = file.replace(/\.(js|ts)$/, "");
+      var name = file.replace(/\.(m?js|ts)$/, "");
       webpackConfig.entry[name] = "./" + file;
     }
   });