diff --git a/packages/eslint-config-react-app/index.js b/packages/eslint-config-react-app/index.js
index fbd3f2a3f97..f09380d3007 100644
--- a/packages/eslint-config-react-app/index.js
+++ b/packages/eslint-config-react-app/index.js
@@ -73,6 +73,8 @@ module.exports = {
       'default-case': 'off',
       // 'tsc' already handles this (https://github.com/typescript-eslint/typescript-eslint/issues/291)
       'no-dupe-class-members': 'off',
+      // 'tsc' already handles this (https://github.com/typescript-eslint/typescript-eslint/issues/477)
+      'no-undef': 'off',
 
       // Add TypeScript specific rules (and turn off ESLint equivalents)
       '@typescript-eslint/no-angle-bracket-type-assertion': 'warn',