diff --git a/crates/fj-kernel/src/operations/build/shell.rs b/crates/fj-kernel/src/operations/build/shell.rs
index a2fe7f515..c18b6bc06 100644
--- a/crates/fj-kernel/src/operations/build/shell.rs
+++ b/crates/fj-kernel/src/operations/build/shell.rs
@@ -57,7 +57,8 @@ pub trait BuildShell {
                     .insert(services)
             });
 
-        let triangles = [abc, bad, dac, cbd].map(|face| face.insert(services));
+        let triangles =
+            [abc, bad, dac, cbd].map(|triangle| triangle.insert(services));
         let shell =
             Shell::new(triangles.iter().map(|triangle| triangle.face.clone()));