diff --git a/src/Squidex/app-config/webpack.config.js b/src/Squidex/app-config/webpack.config.js
index 8c46363b7..9a4117253 100644
--- a/src/Squidex/app-config/webpack.config.js
+++ b/src/Squidex/app-config/webpack.config.js
@@ -303,7 +303,7 @@ module.exports = function (env) {
         config.module.rules.push({
             test: /\.ts$/,
             use: [{
-                loader: 'istanbul-instrumenter-loader'
+                loader: 'istanbul-instrumenter-loader?esModules=true'
             }, {
                 loader: 'ts-loader'
             }],
diff --git a/src/Squidex/tsconfig.json b/src/Squidex/tsconfig.json
index e9f57692f..4f1e25b08 100644
--- a/src/Squidex/tsconfig.json
+++ b/src/Squidex/tsconfig.json
@@ -7,6 +7,7 @@
     "importHelpers": true,
     "lib": ["es6", "esnext", "dom"],
     "moduleResolution": "node",
+    "module": "esnext",
     "noEmitHelpers": true,
     "noImplicitAny": true,
     "noUnusedLocals": true,