diff --git a/test/integration/mesh-grant-end-to-end.test.ts b/test/integration/mesh-grant-end-to-end.test.ts
index 172fdc1..509325b 100644
--- a/test/integration/mesh-grant-end-to-end.test.ts
+++ b/test/integration/mesh-grant-end-to-end.test.ts
@@ -152,6 +152,9 @@ test("the mesh grants a consumer redis's cache, and the credential it delivers a
   const consumerManifest = JSON.stringify({
     module: "cacheuser",
     version: "1",
+    // `mesh_anchor_cacheuser` is 21 characters, over the 20 a backend keeps (ADR 0049); the slug
+    // makes the consumer identity `mesh_anchor_cache`.
+    slug: "cache",
     requires: ["redis-cache"],
     // `contributes` (not just `requires`) is what makes a consumer *ask* — the grant forms from a
     // contribution. It must be non-empty; redis's provisioner ignores the value (it uses the login