diff --git a/crates/fj-kernel/src/geometry/region.rs b/crates/fj-kernel/src/geometry/region.rs
index 7731a44c0..e854408eb 100644
--- a/crates/fj-kernel/src/geometry/region.rs
+++ b/crates/fj-kernel/src/geometry/region.rs
@@ -28,12 +28,12 @@ impl Region {
     /// Construct an instance of `Region`
     pub fn new(
         exterior: Handle<Cycle>,
-        interiors: Vec<Handle<Cycle>>,
+        interiors: impl IntoIterator<Item = Handle<Cycle>>,
         color: Option<Color>,
     ) -> Self {
         Self {
             exterior,
-            interiors,
+            interiors: interiors.into_iter().collect(),
             color,
         }
     }
diff --git a/crates/fj-kernel/src/objects/full/face.rs b/crates/fj-kernel/src/objects/full/face.rs
index 2dd26e6da..8a824b02a 100644
--- a/crates/fj-kernel/src/objects/full/face.rs
+++ b/crates/fj-kernel/src/objects/full/face.rs
@@ -47,8 +47,6 @@ impl Face {
         interiors: impl IntoIterator<Item = Handle<Cycle>>,
         color: Option<Color>,
     ) -> Self {
-        let interiors = interiors.into_iter().collect();
-
         Self {
             surface,
             region: Region::new(exterior, interiors, color),