diff --git a/pageserver/src/tenant/timeline.rs b/pageserver/src/tenant/timeline.rs
index 1338f9bc1e..24e3058f8f 100644
--- a/pageserver/src/tenant/timeline.rs
+++ b/pageserver/src/tenant/timeline.rs
@@ -155,9 +155,8 @@ impl LayerFileManager {
         expected: Arc<dyn PersistentLayer>,
         new: Arc<dyn PersistentLayer>,
     ) -> Result<()> {
-        use super::layer_map::LayerKey;
-        let key = LayerKey::from(&*expected);
-        let other = LayerKey::from(&*new);
+        let key = expected.layer_desc().key();
+        let other = new.layer_desc().key();
 
         let expected_l0 = LayerMap::is_l0(expected.layer_desc());
         let new_l0 = LayerMap::is_l0(new.layer_desc());