diff --git a/experiments/2024-12-09/src/geometry/operation.rs b/experiments/2024-12-09/src/geometry/operation.rs
index 8c198334e..4ce6b241e 100644
--- a/experiments/2024-12-09/src/geometry/operation.rs
+++ b/experiments/2024-12-09/src/geometry/operation.rs
@@ -3,7 +3,7 @@ use std::{fmt, ops::Deref, rc::Rc};
 use super::tri_mesh::TriMesh;
 
 pub trait Operation: fmt::Display {
-    fn triangles(&self, triangles: &mut TriMesh);
+    fn triangles(&self, mesh: &mut TriMesh);
     fn children(&self) -> Vec<AnyOp>;
 }