diff --git a/crates/fj-core/src/operations/split/edge.rs b/crates/fj-core/src/operations/split/edge.rs
index 269bac663..774bb9d4b 100644
--- a/crates/fj-core/src/operations/split/edge.rs
+++ b/crates/fj-core/src/operations/split/edge.rs
@@ -3,7 +3,7 @@ use fj_math::Point;
 use crate::{
     objects::{HalfEdge, Shell},
     operations::{
-        derive::DeriveFrom, geometry::UpdateHalfEdgeGeometry, insert::Insert,
+        geometry::UpdateHalfEdgeGeometry, insert::Insert,
         replace::ReplaceHalfEdge, split::SplitHalfEdge, update::UpdateHalfEdge,
     },
     queries::SiblingOfHalfEdge,
@@ -42,7 +42,7 @@ impl SplitEdge for Shell {
 
         let [half_edge_a, half_edge_b] = half_edge
             .split_half_edge(point, core)
-            .map(|half_edge_part| half_edge_part.derive_from(half_edge, core));
+            .map(|half_edge_part| half_edge_part);
 
         let siblings = {
             let [sibling_a, sibling_b] = sibling.split_half_edge(point, core);
@@ -53,7 +53,7 @@ impl SplitEdge for Shell {
                 )
                 .insert(core);
             [sibling_a, sibling_b].map(|half_edge| {
-                half_edge.derive_from(&sibling, core).set_path(
+                half_edge.set_path(
                     core.layers.geometry.of_half_edge(&sibling).path,
                     &mut core.layers.geometry,
                 )
diff --git a/crates/fj-core/src/operations/split/half_edge.rs b/crates/fj-core/src/operations/split/half_edge.rs
index c899e3222..34dacf019 100644
--- a/crates/fj-core/src/operations/split/half_edge.rs
+++ b/crates/fj-core/src/operations/split/half_edge.rs
@@ -3,7 +3,7 @@ use fj_math::Point;
 use crate::{
     geometry::HalfEdgeGeometry,
     objects::{HalfEdge, Vertex},
-    operations::insert::Insert,
+    operations::{derive::DeriveFrom, insert::Insert},
     storage::Handle,
     Core,
 };
@@ -48,13 +48,15 @@ impl SplitHalfEdge for Handle<HalfEdge> {
             self.curve().clone(),
             self.start_vertex().clone(),
         )
-        .insert(core);
+        .insert(core)
+        .derive_from(self, core);
         let b = HalfEdge::new(
             [point, end],
             self.curve().clone(),
             Vertex::new().insert(core),
         )
-        .insert(core);
+        .insert(core)
+        .derive_from(self, core);
 
         core.layers.geometry.define_half_edge(
             a.clone(),