diff --git a/src/renderer/inbox/components/settings/AutostartSection.tsx b/src/renderer/inbox/components/settings/AutostartSection.tsx
index 9e27e4e..509a686 100644
--- a/src/renderer/inbox/components/settings/AutostartSection.tsx
+++ b/src/renderer/inbox/components/settings/AutostartSection.tsx
@@ -18,6 +18,14 @@ export function AutostartSection(): React.ReactElement {
     setData(r);
   }
 
+  // Task 24 — 현재 openAtLogin 값으로 다시 setLoginItemSettings 호출 → mismatch 복구.
+  // (예: registry 누락된 채로 withArgs.openAtLogin=true 인 경우 등.)
+  async function onReregister(): Promise<void> {
+    if (!data) return;
+    const r = await inboxApi.setAutostart(data.openAtLogin);
+    setData(r);
+  }
+
   if (data === null) {
     return <div style={{ fontSize: 12, color: '#666' }}>로딩 중...</div>;
   }
@@ -40,6 +48,14 @@ export function AutostartSection(): React.ReactElement {
           ⚠️ 등록 상태 불일치 감지 — 진단 정보 확인 후 재등록을 시도하세요.
         </div>
       )}
+      <div style={{ marginTop: 6 }}>
+        <button
+          onClick={() => { void onReregister(); }}
+          style={{ fontSize: 12, padding: '4px 10px' }}
+        >
+          재등록
+        </button>
+      </div>
       <button
         onClick={() => setExpanded(!expanded)}
         style={{
diff --git a/tests/unit/AutostartSection.test.tsx b/tests/unit/AutostartSection.test.tsx
index 234143b..99bd669 100644
--- a/tests/unit/AutostartSection.test.tsx
+++ b/tests/unit/AutostartSection.test.tsx
@@ -96,4 +96,20 @@ describe('AutostartSection', () => {
     await screen.findByRole('checkbox');
     expect(screen.queryByText(/⚠️/)).not.toBeInTheDocument();
   });
+
+  it('"재등록" button calls setAutostart with current openAtLogin value', async () => {
+    const { inboxApi } = await import('../../src/renderer/inbox/api.js');
+    vi.mocked(inboxApi.getAutostart).mockResolvedValueOnce({
+      openAtLogin: true,
+      diagnostic: {
+        withArgs: { openAtLogin: true, executableWillLaunchAtLogin: true },
+        noArgs: { openAtLogin: true, executableWillLaunchAtLogin: true },
+        execPath: '/p'
+      }
+    });
+    render(<AutostartSection />);
+    await screen.findByRole('checkbox');
+    fireEvent.click(screen.getByRole('button', { name: /재등록/ }));
+    await waitFor(() => expect(inboxApi.setAutostart).toHaveBeenCalledWith(true));
+  });
 });