diff --git a/src/button-group/__tests__/button-group.test.tsx b/src/button-group/__tests__/button-group.test.tsx
index ace5d09055..9594dd1cdf 100644
--- a/src/button-group/__tests__/button-group.test.tsx
+++ b/src/button-group/__tests__/button-group.test.tsx
@@ -126,6 +126,21 @@ describe('ButtonGroup', () => {
     expect(queryByTitle('testButton')?.getAttribute('aria-checked')).toBeTruthy();
   });
 
+  it('preserves injected aria-checked/role when a child also sets overrides.BaseButton', () => {
+    const { container } = render(
+      <ButtonGroup mode={MODE.radio} selected={0}>
+        <Button overrides={{ BaseButton: { style: { fontWeight: 'bold' } } }} />
+        <Button />
+      </ButtonGroup>
+    );
+
+    const buttons = Array.from(container.querySelectorAll('button'));
+    expect(buttons[0].getAttribute('role')).toBe('radio');
+    expect(buttons[0].getAttribute('aria-checked')).toBe('true');
+    expect(buttons[1].getAttribute('role')).toBe('radio');
+    expect(buttons[1].getAttribute('aria-checked')).toBe('false');
+  });
+
   it('should handle null children', () => {
     const { container } = render(
       <ButtonGroup>
diff --git a/src/button-group/button-group.tsx b/src/button-group/button-group.tsx
index fbd9313e77..1e60111ac5 100644
--- a/src/button-group/button-group.tsx
+++ b/src/button-group/button-group.tsx
@@ -138,7 +138,9 @@ export default class ButtonGroup extends React.Component<ButtonGroupProps> {
                 shape,
                 size,
                 overrides: {
+                  ...child.props.overrides,
                   BaseButton: {
+                    ...child.props.overrides?.BaseButton,
                     props: {
                       ...(typeof child.props['aria-checked'] === 'boolean'
                         ? {
@@ -153,10 +155,9 @@ export default class ButtonGroup extends React.Component<ButtonGroupProps> {
                           : !isSimpleClickableBtnGroup
                           ? 'checkbox'
                           : undefined,
+                      ...child.props.overrides?.BaseButton?.props,
                     },
                   },
-
-                  ...child.props.overrides,
                 },
               });
             })}