diff --git a/crates/fj-core/src/operations/geometry/half_edge.rs b/crates/fj-core/src/operations/geometry/half_edge.rs
index 9897abc1b..54de2f73f 100644
--- a/crates/fj-core/src/operations/geometry/half_edge.rs
+++ b/crates/fj-core/src/operations/geometry/half_edge.rs
@@ -1,6 +1,11 @@
+use fj_math::Point;
+
 use crate::{
-    geometry::SurfacePath, objects::HalfEdge, operations::insert::Insert,
-    storage::Handle, Core,
+    geometry::{CurveBoundary, SurfacePath},
+    objects::HalfEdge,
+    operations::insert::Insert,
+    storage::Handle,
+    Core,
 };
 
 /// Update the geometry of a [`HalfEdge`]
@@ -12,6 +17,14 @@ pub trait UpdateHalfEdgeGeometry {
         update: impl FnOnce(SurfacePath) -> SurfacePath,
         core: &mut Core,
     ) -> Self;
+
+    /// Update the boundary of the edge
+    #[must_use]
+    fn update_boundary(
+        &self,
+        update: impl FnOnce(CurveBoundary<Point<1>>) -> CurveBoundary<Point<1>>,
+        core: &mut Core,
+    ) -> Self;
 }
 
 impl UpdateHalfEdgeGeometry for Handle<HalfEdge> {
@@ -30,4 +43,18 @@ impl UpdateHalfEdgeGeometry for Handle<HalfEdge> {
         )
         .insert(core)
     }
+
+    fn update_boundary(
+        &self,
+        update: impl FnOnce(CurveBoundary<Point<1>>) -> CurveBoundary<Point<1>>,
+        core: &mut Core,
+    ) -> Self {
+        HalfEdge::new(
+            self.path(),
+            update(self.boundary()),
+            self.curve().clone(),
+            self.start_vertex().clone(),
+        )
+        .insert(core)
+    }
 }
diff --git a/crates/fj-core/src/operations/update/half_edge.rs b/crates/fj-core/src/operations/update/half_edge.rs
index 697d74fed..f10ace4d6 100644
--- a/crates/fj-core/src/operations/update/half_edge.rs
+++ b/crates/fj-core/src/operations/update/half_edge.rs
@@ -1,7 +1,4 @@
-use fj_math::Point;
-
 use crate::{
-    geometry::CurveBoundary,
     objects::{Curve, HalfEdge, Vertex},
     operations::{derive::DeriveFrom, insert::Insert},
     storage::Handle,
@@ -10,13 +7,6 @@ use crate::{
 
 /// Update a [`HalfEdge`]
 pub trait UpdateHalfEdge {
-    /// Update the boundary of the edge
-    #[must_use]
-    fn update_boundary(
-        &self,
-        update: impl FnOnce(CurveBoundary<Point<1>>) -> CurveBoundary<Point<1>>,
-    ) -> Self;
-
     /// Update the curve of the edge
     #[must_use]
     fn update_curve<T>(
@@ -39,18 +29,6 @@ pub trait UpdateHalfEdge {
 }
 
 impl UpdateHalfEdge for HalfEdge {
-    fn update_boundary(
-        &self,
-        update: impl FnOnce(CurveBoundary<Point<1>>) -> CurveBoundary<Point<1>>,
-    ) -> Self {
-        HalfEdge::new(
-            self.path(),
-            update(self.boundary()),
-            self.curve().clone(),
-            self.start_vertex().clone(),
-        )
-    }
-
     fn update_curve<T>(
         &self,
         update: impl FnOnce(&Handle<Curve>, &mut Core) -> T,
diff --git a/crates/fj-core/src/validate/shell.rs b/crates/fj-core/src/validate/shell.rs
index 67c924c70..48bf7a8cb 100644
--- a/crates/fj-core/src/validate/shell.rs
+++ b/crates/fj-core/src/validate/shell.rs
@@ -436,9 +436,10 @@ mod tests {
                                                 |path| path.reverse(),
                                                 core,
                                             )
-                                            .update_boundary(|boundary| {
-                                                boundary.reverse()
-                                            })]
+                                            .update_boundary(
+                                                |boundary| boundary.reverse(),
+                                                core,
+                                            )]
                                     },
                                     core,
                                 )