diff --git a/packages/playwright-core/src/server/injected/injectedScript.ts b/packages/playwright-core/src/server/injected/injectedScript.ts
index fb16c64ea3..8bea09ade0 100644
--- a/packages/playwright-core/src/server/injected/injectedScript.ts
+++ b/packages/playwright-core/src/server/injected/injectedScript.ts
@@ -29,7 +29,7 @@ import type { CSSComplexSelectorList } from '../isomorphic/cssParser';
 import { generateSelector } from './selectorGenerator';
 import type * as channels from '@protocol/channels';
 import { Highlight } from './highlight';
-import { getAriaCheckedStrict, getAriaDisabled, getAriaLabelledByElements, getAriaRole, getElementAccessibleName } from './roleUtils';
+import { getChecked, getAriaDisabled, getAriaLabelledByElements, getAriaRole, getElementAccessibleName } from './roleUtils';
 import { kLayoutSelectorNames, type LayoutSelectorName, layoutSelectorScore } from './layoutSelectorUtils';
 import { asLocator } from '../isomorphic/locatorGenerators';
 import type { Language } from '../isomorphic/locatorGenerators';
@@ -614,7 +614,7 @@ export class InjectedScript {
 
     if (state === 'checked' || state === 'unchecked') {
       const need = state === 'checked';
-      const checked = getAriaCheckedStrict(element);
+      const checked = getChecked(element, false);
       if (checked === 'error')
         throw this.createStacklessError('Not a checkbox or radio button');
       return need === checked;
diff --git a/packages/playwright-core/src/server/injected/roleUtils.ts b/packages/playwright-core/src/server/injected/roleUtils.ts
index c3c5eecb9c..53455be8c4 100644
--- a/packages/playwright-core/src/server/injected/roleUtils.ts
+++ b/packages/playwright-core/src/server/injected/roleUtils.ts
@@ -662,13 +662,13 @@ export function getAriaSelected(element: Element): boolean {
 
 export const kAriaCheckedRoles = ['checkbox', 'menuitemcheckbox', 'option', 'radio', 'switch', 'menuitemradio', 'treeitem'];
 export function getAriaChecked(element: Element): boolean | 'mixed' {
-  const result = getAriaCheckedStrict(element);
+  const result = getChecked(element, true);
   return result === 'error' ? false : result;
 }
-export function getAriaCheckedStrict(element: Element): boolean | 'mixed' | 'error' {
+export function getChecked(element: Element, allowMixed: boolean): boolean | 'mixed' | 'error' {
   // https://www.w3.org/TR/wai-aria-1.2/#aria-checked
   // https://www.w3.org/TR/html-aam-1.0/#html-attribute-state-and-property-mappings
-  if (element.tagName === 'INPUT' && (element as HTMLInputElement).indeterminate)
+  if (allowMixed && element.tagName === 'INPUT' && (element as HTMLInputElement).indeterminate)
     return 'mixed';
   if (element.tagName === 'INPUT' && ['checkbox', 'radio'].includes((element as HTMLInputElement).type))
     return (element as HTMLInputElement).checked;
@@ -676,7 +676,7 @@ export function getAriaCheckedStrict(element: Element): boolean | 'mixed' | 'err
     const checked = element.getAttribute('aria-checked');
     if (checked === 'true')
       return true;
-    if (checked === 'mixed')
+    if (allowMixed && checked === 'mixed')
       return 'mixed';
     return false;
   }
diff --git a/tests/page/locator-convenience.spec.ts b/tests/page/locator-convenience.spec.ts
index de4b9f90e6..fa58badac8 100644
--- a/tests/page/locator-convenience.spec.ts
+++ b/tests/page/locator-convenience.spec.ts
@@ -144,6 +144,21 @@ it('isChecked should work', async ({ page }) => {
   expect(error.message).toContain('Not a checkbox or radio button');
 });
 
+it('isChecked should work for indeterminate input', async ({ page }) => {
+  it.info().annotations.push({ type: 'issue', description: 'https://github.com/microsoft/playwright/issues/20190' });
+
+  await page.setContent(`<input type="checkbox" checked>`);
+  await page.locator('input').evaluate((e: HTMLInputElement) => e.indeterminate = true);
+
+  expect(await page.locator('input').isChecked()).toBe(true);
+  await expect(page.locator('input')).toBeChecked();
+
+  await page.locator('input').uncheck();
+
+  expect(await page.locator('input').isChecked()).toBe(false);
+  await expect(page.locator('input')).not.toBeChecked();
+});
+
 it('allTextContents should work', async ({ page }) => {
   await page.setContent(`<div>A</div><div>B</div><div>C</div>`);
   expect(await page.locator('div').allTextContents()).toEqual(['A', 'B', 'C']);