diff --git a/crates/fj-core/src/objects/set.rs b/crates/fj-core/src/objects/set.rs
index 791ff1d0b..39b45c6e9 100644
--- a/crates/fj-core/src/objects/set.rs
+++ b/crates/fj-core/src/objects/set.rs
@@ -1,7 +1,8 @@
 use std::collections::{btree_set, BTreeSet};
 
 use super::{
-    BehindHandle, Cycle, Face, GlobalEdge, HalfEdge, Object, Surface, Vertex,
+    BehindHandle, Curve, Cycle, Face, GlobalEdge, HalfEdge, Object, Surface,
+    Vertex,
 };
 
 /// A graph of objects and their relationships
@@ -57,6 +58,10 @@ trait InsertIntoSet {
     fn insert_into_set(&self, objects: &mut ObjectSet);
 }
 
+impl InsertIntoSet for Curve {
+    fn insert_into_set(&self, _: &mut ObjectSet) {}
+}
+
 impl InsertIntoSet for Cycle {
     fn insert_into_set(&self, objects: &mut ObjectSet) {
         for half_edge in self.half_edges() {