diff --git a/src/main/runtime/runtime-failed-local-worktree-removal.test.ts b/src/main/runtime/runtime-failed-local-worktree-removal.test.ts
index c2af302ca3a..0d8d12fe198 100644
--- a/src/main/runtime/runtime-failed-local-worktree-removal.test.ts
+++ b/src/main/runtime/runtime-failed-local-worktree-removal.test.ts
@@ -201,6 +201,10 @@ async function failInSession(): Promise<unknown> {
 
 describe.skipIf(process.platform !== 'darwin')('a worktree delete Git fails partway', () => {
   beforeEach(async () => {
+    // A git hook's GIT_DIR/GIT_INDEX_FILE would point the scratch repo's git, and Orca's, at the outer repo.
+    for (const key of Object.keys(process.env).filter((name) => name.startsWith('GIT_'))) {
+      vi.stubEnv(key, undefined)
+    }
     vi.spyOn(console, 'warn').mockImplementation(() => {})
     scratchDir = await realpath(await mkdtemp(join(tmpdir(), 'orca-failed-removal-')))
     recordsDir = join(scratchDir, 'profile')
@@ -228,6 +232,7 @@ describe.skipIf(process.platform !== 'darwin')('a worktree delete Git fails part
     _resetPendingWorktreeRemovalsForTests()
     vi.mocked(removeHostTree).mockClear()
     vi.restoreAllMocks()
+    vi.unstubAllEnvs()
     await setImmutable(false, scratchDir)
     expect((await execFileAsync('find', [scratchDir, '-flags', '+uchg'])).stdout).toBe('')
     await removeTree(scratchDir)