diff --git a/crates/fj-kernel/src/objects/cycle.rs b/crates/fj-kernel/src/objects/cycle.rs
index f34237e03..d7d219b02 100644
--- a/crates/fj-kernel/src/objects/cycle.rs
+++ b/crates/fj-kernel/src/objects/cycle.rs
@@ -29,8 +29,8 @@ impl Cycle {
         // surface.
         for edge in &half_edges {
             assert_eq!(
-                &surface,
-                edge.surface(),
+                surface.id(),
+                edge.surface().id(),
                 "Edges in cycle not defined in same surface"
             );
         }