diff --git a/packages/react-devtools-core/src/backend.js b/packages/react-devtools-core/src/backend.js
index 67238c3d83..fa236c2c6b 100644
--- a/packages/react-devtools-core/src/backend.js
+++ b/packages/react-devtools-core/src/backend.js
@@ -189,34 +189,38 @@ export function connectToDevTools(options: ?ConnectOptions) {
         }
       };
 
-      Object.defineProperty(
-        hook,
-        'resolveRNStyle',
-        ({
-          enumerable: false,
-          get() {
-            return lazyResolveRNStyle;
-          },
-          set(value) {
-            lazyResolveRNStyle = value;
-            initAfterTick();
-          },
-        }: Object),
-      );
-      Object.defineProperty(
-        hook,
-        'nativeStyleEditorValidAttributes',
-        ({
-          enumerable: false,
-          get() {
-            return lazyNativeStyleEditorValidAttributes;
-          },
-          set(value) {
-            lazyNativeStyleEditorValidAttributes = value;
-            initAfterTick();
-          },
-        }: Object),
-      );
+      if (!hook.hasOwnProperty('resolveRNStyle')) {
+        Object.defineProperty(
+          hook,
+          'resolveRNStyle',
+          ({
+            enumerable: false,
+            get() {
+              return lazyResolveRNStyle;
+            },
+            set(value) {
+              lazyResolveRNStyle = value;
+              initAfterTick();
+            },
+          }: Object),
+        );
+      }
+      if (!hook.hasOwnProperty('nativeStyleEditorValidAttributes')) {
+        Object.defineProperty(
+          hook,
+          'nativeStyleEditorValidAttributes',
+          ({
+            enumerable: false,
+            get() {
+              return lazyNativeStyleEditorValidAttributes;
+            },
+            set(value) {
+              lazyNativeStyleEditorValidAttributes = value;
+              initAfterTick();
+            },
+          }: Object),
+        );
+      }
     }
   };
 
diff --git a/packages/react-devtools-core/webpack.backend.js b/packages/react-devtools-core/webpack.backend.js
index 1a2dbd2758..f2e85842a6 100644
--- a/packages/react-devtools-core/webpack.backend.js
+++ b/packages/react-devtools-core/webpack.backend.js
@@ -11,6 +11,8 @@ if (!NODE_ENV) {
   process.exit(1);
 }
 
+const builtModulesDir = resolve(__dirname, '..', '..', 'build', 'node_modules');
+
 const __DEV__ = NODE_ENV === 'development';
 
 const GITHUB_URL = getGitHubURL();
@@ -30,6 +32,15 @@ module.exports = {
     library: 'ReactDevToolsBackend',
     libraryTarget: 'umd',
   },
+  resolve: {
+    alias: {
+      react: resolve(builtModulesDir, 'react'),
+      'react-dom': resolve(builtModulesDir, 'react-dom'),
+      'react-debug-tools': resolve(builtModulesDir, 'react-debug-tools'),
+      'react-is': resolve(builtModulesDir, 'react-is'),
+      scheduler: resolve(builtModulesDir, 'scheduler'),
+    },
+  },
   plugins: [
     new DefinePlugin({
       __DEV__: true,
diff --git a/packages/react-devtools-core/webpack.standalone.js b/packages/react-devtools-core/webpack.standalone.js
index 4955a39643..fa3caf4e00 100644
--- a/packages/react-devtools-core/webpack.standalone.js
+++ b/packages/react-devtools-core/webpack.standalone.js
@@ -11,6 +11,8 @@ if (!NODE_ENV) {
   process.exit(1);
 }
 
+const builtModulesDir = resolve(__dirname, '..', '..', 'build', 'node_modules');
+
 const __DEV__ = NODE_ENV === 'development';
 
 const GITHUB_URL = getGitHubURL();
@@ -29,6 +31,15 @@ module.exports = {
     library: '[name]',
     libraryTarget: 'commonjs2',
   },
+  resolve: {
+    alias: {
+      react: resolve(builtModulesDir, 'react'),
+      'react-dom': resolve(builtModulesDir, 'react-dom'),
+      'react-debug-tools': resolve(builtModulesDir, 'react-debug-tools'),
+      'react-is': resolve(builtModulesDir, 'react-is'),
+      scheduler: resolve(builtModulesDir, 'scheduler'),
+    },
+  },
   plugins: [
     new DefinePlugin({
       __DEV__: false,
diff --git a/packages/react-devtools/README.md b/packages/react-devtools/README.md
index 2220a6661d..399bb5a5d5 100644
--- a/packages/react-devtools/README.md
+++ b/packages/react-devtools/README.md
@@ -92,7 +92,7 @@ By default DevTools listen to port `8097` on `localhost`. If you need to customi
 
 ## Developing
 
-* Run `yarn run backend:watch` and `yarn run standalone:watch` in `../react-devtools-core`
+* Run `yarn start:backend` and `yarn start:standalone` in `../react-devtools-core`
 * Run `yarn start` in this folder
 * Refresh the app after it has recompiled a change
 * For React Native, copy `react-devtools-core` to its `node_modules` to test your changes.
\ No newline at end of file