diff --git a/test/helpers/auto-reply/trigger-handling-test-harness.ts b/test/helpers/auto-reply/trigger-handling-test-harness.ts
index 2b1d50ba5d1..2aa3d65d2e6 100644
--- a/test/helpers/auto-reply/trigger-handling-test-harness.ts
+++ b/test/helpers/auto-reply/trigger-handling-test-harness.ts
@@ -127,8 +127,7 @@ const installModelCatalogMock = () =>
 installModelCatalogMock();
 
 vi.doMock("../../../src/agents/model-catalog.runtime.js", () => ({
-  loadManifestModelCatalog: (...args: unknown[]) =>
-    modelCatalogMocks.loadManifestModelCatalog(...args),
+  loadManifestModelCatalog: () => modelCatalogMocks.loadManifestModelCatalog(),
   loadModelCatalog: (...args: unknown[]) => modelCatalogMocks.loadModelCatalog(...args),
 }));