diff --git a/src/runner/__tests__/runESLint.test.js b/src/runner/__tests__/runESLint.test.js
index 26fbdbf..1e16d21 100644
--- a/src/runner/__tests__/runESLint.test.js
+++ b/src/runner/__tests__/runESLint.test.js
@@ -1,7 +1,11 @@
 /* eslint-disable class-methods-use-this, global-require */
 const path = require('path');
 
-const runESLintRunnerWithMockedEngine = ({ mockOptions, runESLintOptions }) => {
+const runESLintRunnerWithMockedEngine = ({
+  mockOptions,
+  runESLintOptions,
+  extraOptions,
+}) => {
   jest.resetModules();
   jest.doMock('eslint', () => ({
     ESLint: class {
@@ -18,11 +22,14 @@ const runESLintRunnerWithMockedEngine = ({ mockOptions, runESLintOptions }) => {
       loadFormatter() {
         return Promise.resolve({ format() {} });
       }
+
+      // eslint-disable-next-line no-unused-vars
+      static outputFixes(report) {}
     },
   }));
   const runESLint = require('../runESLint');
 
-  return runESLint({ extraOptions: {}, ...runESLintOptions });
+  return runESLint({ extraOptions: extraOptions || {}, ...runESLintOptions });
 };
 
 it('Requires the config setupTestFrameworkScriptFile when specified', async () => {
@@ -144,3 +151,21 @@ it('Returns "fail" when the test failed', async () => {
     numPendingTests: 0,
   });
 });
+
+it('Not to be override by undefined in extraOptions', async () => {
+  const result = await runESLintRunnerWithMockedEngine({
+    mockOptions: {
+      ignoredFiles: [],
+      errorCount: 0,
+    },
+    runESLintOptions: {
+      testPath: '/path/to/file.test.js',
+      config: {},
+    },
+    extraOptions: {
+      fix: true,
+    },
+  });
+
+  expect(result.cliOptions.fix).toBeTruthy();
+});
diff --git a/src/runner/runESLint.js b/src/runner/runESLint.js
index 144bb25..173d951 100644
--- a/src/runner/runESLint.js
+++ b/src/runner/runESLint.js
@@ -56,6 +56,7 @@ const mkTestResults = ({
   numPassingTests,
   testPath,
   assertionResults,
+  cliOptions,
 }) => {
   const startTime = new Date(start).getTime();
   const endTime = new Date(end).getTime();
@@ -97,6 +98,7 @@ const mkTestResults = ({
       status: result.status,
       title: result.title,
     })),
+    cliOptions,
   };
 };
 
@@ -122,6 +124,12 @@ const getComputedFixValue = ({ fix, quiet, fixDryRun }) => {
   return undefined;
 };
 
+function removeUndefinedFromObject(object) {
+  return Object.fromEntries(
+    Object.entries(object).filter(([, value]) => typeof value !== 'undefined'),
+  );
+}
+
 const getESLintConstructor = async () => {
   if (await shouldUseFlatConfig()) {
     return FlatESLint;
@@ -162,7 +170,7 @@ const getCachedValues = async (config, extraOptions) => {
     const cliOptions = {
       ...baseCliOptions,
       fix: getComputedFixValue(baseCliOptions),
-      ...extraOptions,
+      ...removeUndefinedFromObject(extraOptions),
     };
 
     const ESLintConstructor = await getESLintConstructor();
@@ -238,6 +246,7 @@ const runESLint = async ({ testPath, config, extraOptions }) => {
       numFailingTests: report[0].errorCount,
       numPassingTests: 0,
       assertionResults: mkAssertionResults(testPath, report),
+      cliOptions,
     });
   }
 
@@ -253,6 +262,7 @@ const runESLint = async ({ testPath, config, extraOptions }) => {
       numFailingTests: 1,
       numPassingTests: 0,
       assertionResults: mkAssertionResults(testPath, report),
+      cliOptions,
     });
   }
 
@@ -268,6 +278,7 @@ const runESLint = async ({ testPath, config, extraOptions }) => {
         status: 'passed',
       },
     ],
+    cliOptions,
   });
 
   if (!cliOptions.quiet && report[0]?.warningCount > 0) {