diff --git a/packages/metro/src/DeltaBundler/DeltaTransformer.js b/packages/metro/src/DeltaBundler/DeltaTransformer.js
index 4f8cb76d..caad1f57 100644
--- a/packages/metro/src/DeltaBundler/DeltaTransformer.js
+++ b/packages/metro/src/DeltaBundler/DeltaTransformer.js
@@ -529,8 +529,8 @@ class DeltaTransformer extends EventEmitter {
 
   _getModuleSystemDependencies() {
     const prelude = this._bundleOptions.dev
-      ? path.resolve(__dirname, '../Resolver/polyfills/prelude_dev.js')
-      : path.resolve(__dirname, '../Resolver/polyfills/prelude.js');
+      ? path.resolve(__dirname, '../lib/polyfills/prelude_dev.js')
+      : path.resolve(__dirname, '../lib/polyfills/prelude.js');
 
     const moduleSystem = defaults.moduleSystem;
 
diff --git a/packages/metro/src/defaults.js b/packages/metro/src/defaults.js
index 872661a4..1ef8377e 100644
--- a/packages/metro/src/defaults.js
+++ b/packages/metro/src/defaults.js
@@ -45,7 +45,7 @@ exports.assetExts = [
 
 exports.sourceExts = ['js', 'json'];
 
-exports.moduleSystem = require.resolve('./Resolver/polyfills/require.js');
+exports.moduleSystem = require.resolve('./lib/polyfills/require.js');
 
 exports.platforms = ['ios', 'android', 'windows', 'web'];
 
diff --git a/packages/metro/src/integration_tests/__tests__/basic_bundle-test.js b/packages/metro/src/integration_tests/__tests__/basic_bundle-test.js
index 0526492d..1ebe147c 100644
--- a/packages/metro/src/integration_tests/__tests__/basic_bundle-test.js
+++ b/packages/metro/src/integration_tests/__tests__/basic_bundle-test.js
@@ -23,7 +23,7 @@ const path = require('path');
 jasmine.DEFAULT_TIMEOUT_INTERVAL = 30 * 1000;
 
 const INPUT_PATH = path.resolve(__dirname, '../basic_bundle');
-const POLYFILLS_PATH = path.resolve(__dirname, '../../Resolver/polyfills');
+const POLYFILLS_PATH = path.resolve(__dirname, '../../lib/polyfills');
 const ASSET_REGISTRY_PATH = path.resolve(
   __dirname,
   '../basic_bundle/AssetRegistry',
diff --git a/packages/metro/src/Resolver/polyfills/__tests__/require-test.js b/packages/metro/src/lib/polyfills/__tests__/require-test.js
similarity index 100%
rename from packages/metro/src/Resolver/polyfills/__tests__/require-test.js
rename to packages/metro/src/lib/polyfills/__tests__/require-test.js
diff --git a/packages/metro/src/Resolver/polyfills/prelude.js b/packages/metro/src/lib/polyfills/prelude.js
similarity index 100%
rename from packages/metro/src/Resolver/polyfills/prelude.js
rename to packages/metro/src/lib/polyfills/prelude.js
diff --git a/packages/metro/src/Resolver/polyfills/prelude_dev.js b/packages/metro/src/lib/polyfills/prelude_dev.js
similarity index 100%
rename from packages/metro/src/Resolver/polyfills/prelude_dev.js
rename to packages/metro/src/lib/polyfills/prelude_dev.js
diff --git a/packages/metro/src/Resolver/polyfills/require.js b/packages/metro/src/lib/polyfills/require.js
similarity index 100%
rename from packages/metro/src/Resolver/polyfills/require.js
rename to packages/metro/src/lib/polyfills/require.js