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