diff --git a/packages/react-debug-tools/src/ReactDebugCustomErrors.js b/packages/react-debug-tools/src/ReactDebugCustomErrors.js
deleted file mode 100644
index ae3a22446a..0000000000
--- a/packages/react-debug-tools/src/ReactDebugCustomErrors.js
+++ /dev/null
@@ -1,27 +0,0 @@
-/**
- * Copyright (c) Facebook, Inc. and its affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- *
- * @flow
- */
-
-/**
- * This file contains a list of custom Errors that ReactDebugTools can throw in
- * special occasions.
- * The names of the errors are exported so that other packages (such as DevTools)
- * can use them to detect and handle them separately.
- */
-
-export const ErrorsNames = {
-  UNSUPPORTTED_FEATURE_ERROR: 'UnsupportedFeatureError',
-};
-
-// For now we just override the name. If we decide to move react-debug-tools to
-// devtools package, we should use a real Error class instead.
-export function createUnsupportedFeatureError(message: string = '') {
-  const error = new Error(message);
-  error.name = ErrorsNames.UNSUPPORTTED_FEATURE_ERROR;
-  return error;
-}
diff --git a/packages/react-debug-tools/src/ReactDebugHooks.js b/packages/react-debug-tools/src/ReactDebugHooks.js
index 9f1a9e2472..c013d3488d 100644
--- a/packages/react-debug-tools/src/ReactDebugHooks.js
+++ b/packages/react-debug-tools/src/ReactDebugHooks.js
@@ -29,7 +29,6 @@ import {
   ContextProvider,
   ForwardRef,
 } from 'react-reconciler/src/ReactWorkTags';
-import {createUnsupportedFeatureError} from './ReactDebugCustomErrors';
 
 type CurrentDispatcherRef = typeof ReactSharedInternals.ReactCurrentDispatcher;
 
@@ -362,11 +361,13 @@ const Dispatcher: DispatcherType = {
 const DispatcherProxyHandler = {
   get(target, prop, _receiver) {
     if (target.hasOwnProperty(prop)) {
-      return Reflect.get(...arguments);
+      return target[prop];
     }
-    throw createUnsupportedFeatureError(
-      'Missing method in Dispatcher: ' + prop,
-    );
+    const error = new Error('Missing method in Dispatcher: ' + prop);
+    // Note: This error name needs to stay in sync with react-devtools-shared
+    // TODO: refactor this if we ever combine the devtools and debug tools packages
+    error.name = 'UnsupportedFeatureError';
+    throw error;
   },
 };
 
diff --git a/packages/react-debug-tools/src/ReactDebugTools.js b/packages/react-debug-tools/src/ReactDebugTools.js
index ca19ce8a08..7f441e0d2f 100644
--- a/packages/react-debug-tools/src/ReactDebugTools.js
+++ b/packages/react-debug-tools/src/ReactDebugTools.js
@@ -8,6 +8,5 @@
  */
 
 import {inspectHooks, inspectHooksOfFiber} from './ReactDebugHooks';
-import {ErrorsNames} from './ReactDebugCustomErrors';
 
-export {inspectHooks, inspectHooksOfFiber, ErrorsNames};
+export {inspectHooks, inspectHooksOfFiber};