diff --git a/crates/fj-core/src/validate/shell.rs b/crates/fj-core/src/validate/shell.rs
index e54800f30..ec72df05e 100644
--- a/crates/fj-core/src/validate/shell.rs
+++ b/crates/fj-core/src/validate/shell.rs
@@ -39,7 +39,7 @@ impl Validate for Shell {
 #[derive(Clone, Debug, thiserror::Error)]
 pub enum ShellValidationError {
     /// [`Shell`] contains a half-edge that is not part of a pair
-    #[error("Half-edge has no sibling: {:#?}", .0.half_edge)]
+    #[error(transparent)]
     HalfEdgeHasNoSibling(HalfEdgeHasNoSibling),
 
     /// [`Shell`] contains half-edges that are coincident, but aren't siblings
diff --git a/crates/fj-core/src/validation/checks/half_edge_siblings.rs b/crates/fj-core/src/validation/checks/half_edge_siblings.rs
index 71e06b226..180206944 100644
--- a/crates/fj-core/src/validation/checks/half_edge_siblings.rs
+++ b/crates/fj-core/src/validation/checks/half_edge_siblings.rs
@@ -11,7 +11,8 @@ use crate::{storage::Handle, topology::HalfEdge};
 /// - If the shell is closed, that its topological object graph is not valid.
 ///
 /// [`Shell`]: crate::topology::Shell
-#[derive(Clone, Debug)]
+#[derive(Clone, Debug, thiserror::Error)]
+#[error("Half-edge has no sibling: {half_edge:#?}")]
 pub struct HalfEdgeHasNoSibling {
     /// The half-edge that does not have a sibling
     pub half_edge: Handle<HalfEdge>,