diff --git a/babel.config.json b/babel.config.json
index cb1cad7f3a..db3716e3ae 100644
--- a/babel.config.json
+++ b/babel.config.json
@@ -12,6 +12,7 @@
     "@babel/plugin-transform-modules-commonjs"
   ],
   "ignore": [
-    "**/*.d.ts"
+    "**/*.d.ts",
+    "packages/playwright-core/src/injected/**/*"
   ]
 }
diff --git a/utils/build/build.js b/utils/build/build.js
index a6df15552e..7080135551 100644
--- a/utils/build/build.js
+++ b/utils/build/build.js
@@ -143,13 +143,7 @@ for (const packageDir of packages) {
     continue;
   steps.push({
     command: 'npx',
-    args: [
-      'babel',
-      ...(watchMode ? ['-w', '--source-maps'] : []),
-      '--extensions', '.ts',
-      '--out-dir', path.join(packageDir, 'lib'),
-      '--ignore', 'packages/playwright-core/src/server/injected/**/*,packages/playwright-core/src/web/**/*',
-      path.join(packageDir, 'src')],
+    args: ['babel', ...(watchMode ? ['-w', '--source-maps'] : []), '--extensions', '.ts', '--out-dir', path.join(packageDir, 'lib'), path.join(packageDir, 'src')],
     shell: true,
   });
 }