diff --git a/src/main/runtime/rpc/methods/worktree-schemas.test.ts b/src/main/runtime/rpc/methods/worktree-schemas.test.ts
index a8f3e35a732..219791cb9cc 100644
--- a/src/main/runtime/rpc/methods/worktree-schemas.test.ts
+++ b/src/main/runtime/rpc/methods/worktree-schemas.test.ts
@@ -46,6 +46,7 @@ describe('worktree RPC schemas', () => {
     const parsed = WorktreeSet.parse({ worktree: 'id:r1::/repos/wt', comment: 'note' })
 
     expect(parsed.displayName).toBeUndefined()
+    expect(Object.prototype.hasOwnProperty.call(parsed, 'displayName')).toBe(false)
   })
 
   it('ignores a non-string display name rather than persisting it', () => {