diff --git a/crates/fj-core/src/geometry/half_edge.rs b/crates/fj-core/src/geometry/half_edge.rs
index 9de702978..0823d6483 100644
--- a/crates/fj-core/src/geometry/half_edge.rs
+++ b/crates/fj-core/src/geometry/half_edge.rs
@@ -3,7 +3,7 @@ use fj_math::Point;
 use super::{CurveBoundary, SurfacePath};
 
 /// The geometry of a half-edge
-#[derive(Copy, Clone)]
+#[derive(Copy, Clone, Debug)]
 pub struct HalfEdgeGeom {
     /// # The path of the half-edge
     ///