diff --git a/crates/fj-kernel/src/algorithms/transform.rs b/crates/fj-kernel/src/algorithms/transform.rs
index 4d48ba39a..31e08dd27 100644
--- a/crates/fj-kernel/src/algorithms/transform.rs
+++ b/crates/fj-kernel/src/algorithms/transform.rs
@@ -1,16 +1,15 @@
 use fj_math::Transform;
 
 use crate::{
-    iter::ObjectIters,
     objects::{Cycle, CyclesInFace, Edge, Face, FaceBRep, Vertex},
     shape::{LocalForm, Shape},
 };
 
 /// Transform a shape
-pub fn transform(shape: &Shape, transform: &Transform) -> Vec<Face> {
+pub fn transform(shape: &[Face], transform: &Transform) -> Vec<Face> {
     let mut target = Vec::new();
 
-    for face in shape.face_iter() {
+    for face in shape {
         let face = match face {
             Face::Face(face) => {
                 let mut tmp = Shape::new();
@@ -32,7 +31,7 @@ pub fn transform(shape: &Shape, transform: &Transform) -> Vec<Face> {
             Face::Triangles(triangles) => {
                 let mut target = Vec::new();
 
-                for (triangle, color) in triangles {
+                for &(triangle, color) in triangles {
                     let triangle = transform.transform_triangle(&triangle);
                     target.push((triangle, color));
                 }
diff --git a/crates/fj-operations/src/transform.rs b/crates/fj-operations/src/transform.rs
index b44acb58b..39eb98380 100644
--- a/crates/fj-operations/src/transform.rs
+++ b/crates/fj-operations/src/transform.rs
@@ -1,6 +1,7 @@
 use fj_interop::debug::DebugInfo;
 use fj_kernel::{
     algorithms::{transform, Tolerance},
+    iter::ObjectIters,
     shape::Shape,
     validation::{validate, Validated, ValidationConfig, ValidationError},
 };
@@ -18,6 +19,7 @@ impl ToShape for fj::Transform {
         let shape = self.shape.to_shape(config, tolerance, debug_info)?;
         let shape = shape.into_inner();
 
+        let shape = shape.face_iter().collect::<Vec<_>>();
         let faces = transform(&shape, &make_transform(self));
 
         let mut target = Shape::new();