diff --git a/crates/fj-core/src/geometry/curve.rs b/crates/fj-core/src/geometry/curve.rs
index ba9c50ae7..6362a138a 100644
--- a/crates/fj-core/src/geometry/curve.rs
+++ b/crates/fj-core/src/geometry/curve.rs
@@ -5,7 +5,7 @@ use crate::{storage::Handle, topology::Surface};
 use super::SurfacePath;
 
 /// The geometric definition of a curve
-#[derive(Clone, Default)]
+#[derive(Clone, Debug, Default)]
 pub struct CurveGeom {
     /// # The redundant local definitions of the curve geometry
     ///
@@ -42,7 +42,7 @@ impl CurveGeom {
 }
 
 /// The geometric definition of a curve in 2D surface coordinates
-#[derive(Clone)]
+#[derive(Clone, Debug)]
 pub struct LocalCurveGeom {
     /// The path that defines the curve on its surface
     pub path: SurfacePath,
diff --git a/crates/fj-core/src/operations/holes.rs b/crates/fj-core/src/operations/holes.rs
index fb1340cbc..706ceac4e 100644
--- a/crates/fj-core/src/operations/holes.rs
+++ b/crates/fj-core/src/operations/holes.rs
@@ -130,7 +130,23 @@ impl AddHole for Shell {
             exit_location.face,
             |face, core| {
                 [face.update_region(
-                    |region, core| region.add_interiors([exit.clone()], core),
+                    |region, core| {
+                        for half_edge in exit.half_edges() {
+                            let geometry = core
+                                .layers
+                                .geometry
+                                .of_curve(half_edge.curve())
+                                .unwrap()
+                                .local_on(swept_region.top_face.surface())
+                                .unwrap();
+                            core.layers.geometry.define_curve(
+                                half_edge.curve().clone(),
+                                exit_location.face.surface().clone(),
+                                geometry.clone(),
+                            );
+                        }
+                        region.add_interiors([exit.clone()], core)
+                    },
                     core,
                 )]
             },