diff --git a/packages/lwc-integration/scripts/build.js b/packages/lwc-integration/scripts/build.js
index e89d5fd347..1c66222ce4 100644
--- a/packages/lwc-integration/scripts/build.js
+++ b/packages/lwc-integration/scripts/build.js
@@ -88,14 +88,17 @@ const baseInputConfig = {
     plugins: [
         entryPointResolverPlugin(),
         rollupLwcCompilerPlugin({
-            mode: 'dev',
+            mode,
             exclude: `**/*${testSufix}`,
             resolveFromPackages: false,
             mapNamespaceFromPath: false,
             ignoreFolderName: true,
-            allowUnnamespaced: true
+            allowUnnamespaced: true,
+            compat: { // In order to build faster we manually add compat artifacts later
+                downgrade: false,
+                polyfills: false
+            }
         }),
-        isCompat && rollupCompatPlugin({ downgrade: true, polyfills: true }),
         testCaseComponentResolverPlugin(),
     ].filter(Boolean)
 };
diff --git a/packages/lwc-integration/src/shared/templates.js b/packages/lwc-integration/src/shared/templates.js
index f850ce2325..62bae19e99 100644
--- a/packages/lwc-integration/src/shared/templates.js
+++ b/packages/lwc-integration/src/shared/templates.js
@@ -14,7 +14,7 @@ exports.todoApp = function (cmpName) {
         import { createElement, register } from 'engine';
         import Cmp from '${cmpName}';
 
-        registerWireService(register, () => {
+        registerWireService(register, function () {
             return {
                 serviceTodo
             };