diff --git a/experiments/2024-12-09/src/view.rs b/experiments/2024-12-09/src/view.rs
index a85869925..2eed5efec 100644
--- a/experiments/2024-12-09/src/view.rs
+++ b/experiments/2024-12-09/src/view.rs
@@ -56,7 +56,7 @@ impl OperationView {
     }
 
     fn last_index(&self) -> usize {
-        self.operations().count().saturating_sub(1)
+        self.children.len().saturating_sub(1)
     }
 }