diff --git a/packages/mui-base/src/RadioGroup/Root/RadioGroupRoot.test.tsx b/packages/mui-base/src/RadioGroup/Root/RadioGroupRoot.test.tsx
index 3657c47c53..a1cafaf64e 100644
--- a/packages/mui-base/src/RadioGroup/Root/RadioGroupRoot.test.tsx
+++ b/packages/mui-base/src/RadioGroup/Root/RadioGroupRoot.test.tsx
@@ -184,7 +184,7 @@ describe('<RadioGroup.Root />', () => {
 
     submitButton.click();
 
-    expect(stringifiedFormData).to.equal('');
+    expect(stringifiedFormData).to.equal('group=');
 
     await act(() => {
       radioA.click();