diff --git a/.changeset/6548-stale-test-name.md b/.changeset/6548-stale-test-name.md
new file mode 100644
index 000000000..50ccd2cc9
--- /dev/null
+++ b/.changeset/6548-stale-test-name.md
@@ -0,0 +1,8 @@
+---
+---
+
+Test-only change in `@object-ui/core`: renamed one `it()` in
+`actionDef-closed-surface.test.ts` so its reported name cites `tsconfig.test.json`,
+the project that actually compiles the file, instead of the retired
+`tsconfig.typetests.json` (objectui#4040). No assertion, source file or published
+behaviour changes — only the string the runner prints.
diff --git a/packages/core/src/actions/__tests__/actionDef-closed-surface.test.ts b/packages/core/src/actions/__tests__/actionDef-closed-surface.test.ts
index 45d13007e..e56e2e2f6 100644
--- a/packages/core/src/actions/__tests__/actionDef-closed-surface.test.ts
+++ b/packages/core/src/actions/__tests__/actionDef-closed-surface.test.ts
@@ -121,7 +121,7 @@ const _navigationAlias: ActionDef = {
 const _navNewTabString: ActionDef = { type: 'navigation', to: '/x', newTab: 'new-tab' };
 
 describe('ActionDef is a closed surface (objectstack#4075 step 3)', () => {
-  it('states its contract as types, compiled by tsconfig.typetests.json', () => {
+  it('states its contract as types, compiled by tsconfig.test.json', () => {
     // The assertions above are the test. This body exists so the file is a
     // legitimate vitest suite as well as a tsc input, and so a reader running
     // the suite sees the pin acknowledged rather than an empty file.