diff --git a/docs/plans/M5d2/files/crates/memoryd/tests/tiers.rs b/docs/plans/M5d2/files/crates/memoryd/tests/tiers.rs
index 2973108..71ff8f5 100644
--- a/docs/plans/M5d2/files/crates/memoryd/tests/tiers.rs
+++ b/docs/plans/M5d2/files/crates/memoryd/tests/tiers.rs
@@ -13,7 +13,7 @@ fn now() -> Timestamp {
 }
 
 struct Setup {
-    dir: TempDir,
+    _dir: TempDir,
     store: Store,
 }
 
@@ -22,7 +22,7 @@ fn setup(tag: &str) -> Setup {
     let starter = dir.write("etc/soul.md", "Soul.\n");
     let store = Store::new(&dir.path().join("memory"));
     store.init(&starter).unwrap();
-    Setup { dir, store }
+    Setup { _dir: dir, store }
 }
 
 fn write_recall(store: &Store, line: &str) {