diff --git a/config/karma.config.js b/config/karma.config.js
index 2f571978e08..e459f5cdac3 100644
--- a/config/karma.config.js
+++ b/config/karma.config.js
@@ -8,6 +8,7 @@ if (webpackConfig.plugins) {
   webpackConfig.plugins = webpackConfig.plugins.filter(function (plugin) {
     return !(
       plugin instanceof webpack.optimize.CommonsChunkPlugin ||
+      plugin instanceof webpack.optimize.ModuleConcatenationPlugin ||
       plugin instanceof webpack.DefinePlugin
     );
   });