diff --git a/crates/fj-kernel/src/builder/edge.rs b/crates/fj-kernel/src/builder/edge.rs
index af7e4daf3..5c65f36bc 100644
--- a/crates/fj-kernel/src/builder/edge.rs
+++ b/crates/fj-kernel/src/builder/edge.rs
@@ -223,7 +223,7 @@ impl HalfEdgeBuilder for PartialHalfEdge {
         other: &Partial<HalfEdge>,
         surface: &SurfaceGeometry,
     ) {
-        let global_curve = other.read().curve.read().global_form.clone();
+        let global_curve = other.read().global_form.read().curve.clone();
         self.curve.write().global_form = global_curve.clone();
         self.global_form.write().curve = global_curve;