diff --git a/crates/editor/src/multi_buffer.rs b/crates/editor/src/multi_buffer.rs
index 1b567d69938f507382ec2f892999f0fa6a25a179..756d21e9b5193156b9fc8607be65aa0919b96e29 100644
--- a/crates/editor/src/multi_buffer.rs
+++ b/crates/editor/src/multi_buffer.rs
@@ -36,7 +36,7 @@ pub type ExcerptId = Locator;
 pub struct MultiBuffer {
     snapshot: RefCell<MultiBufferSnapshot>,
     buffers: RefCell<HashMap<usize, BufferState>>,
-    used_excerpt_ids: SumTree<Locator>,
+    used_excerpt_ids: SumTree<ExcerptId>,
     subscriptions: Topic,
     singleton: bool,
     replica_id: ReplicaId,