diff --git a/packages/react-dom/src/__tests__/ReactDOMHooks-test.js b/packages/react-dom/src/__tests__/ReactDOMHooks-test.js
index c703d5e86a1c2..f5f8a61b4171c 100644
--- a/packages/react-dom/src/__tests__/ReactDOMHooks-test.js
+++ b/packages/react-dom/src/__tests__/ReactDOMHooks-test.js
@@ -11,7 +11,6 @@
 
 let React;
 let ReactDOM;
-let act;
 let Scheduler;
 
 describe('ReactDOMHooks', () => {
@@ -22,7 +21,6 @@ describe('ReactDOMHooks', () => {
 
     React = require('react');
     ReactDOM = require('react-dom');
-    act = require('react-dom/test-utils').act;
     Scheduler = require('scheduler');
 
     container = document.createElement('div');
diff --git a/packages/react-dom/src/__tests__/ReactErrorBoundaries-test.internal.js b/packages/react-dom/src/__tests__/ReactErrorBoundaries-test.internal.js
index 81c333e4b44f5..478d30d136538 100644
--- a/packages/react-dom/src/__tests__/ReactErrorBoundaries-test.internal.js
+++ b/packages/react-dom/src/__tests__/ReactErrorBoundaries-test.internal.js
@@ -14,7 +14,6 @@ let React;
 let ReactDOM;
 let act;
 let ReactFeatureFlags;
-let Scheduler;
 
 describe('ReactErrorBoundaries', () => {
   let log;
@@ -47,7 +46,6 @@ describe('ReactErrorBoundaries', () => {
     ReactDOM = require('react-dom');
     React = require('react');
     act = require('react-dom/test-utils').act;
-    Scheduler = require('scheduler');
 
     log = [];
 
diff --git a/packages/react/src/__tests__/withComponentStack-test.js b/packages/react/src/__tests__/withComponentStack-test.js
index 3b26db7357e24..3f9a709816e85 100644
--- a/packages/react/src/__tests__/withComponentStack-test.js
+++ b/packages/react/src/__tests__/withComponentStack-test.js
@@ -44,16 +44,13 @@ describe('withComponentStack', () => {
   let React = null;
   let ReactTestRenderer = null;
   let error = null;
-  let scheduler = null;
   let warn = null;
 
   beforeEach(() => {
     jest.resetModules();
-    jest.mock('scheduler', () => require('scheduler/unstable_mock'));
 
     React = require('react');
     ReactTestRenderer = require('react-test-renderer');
-    scheduler = require('scheduler');
 
     error = React.error;
     warn = React.warn;