diff --git a/crates/fj-core/src/operations/sweep/cycle.rs b/crates/fj-core/src/operations/sweep/cycle.rs
index 4d00d294a..d4c50953d 100644
--- a/crates/fj-core/src/operations/sweep/cycle.rs
+++ b/crates/fj-core/src/operations/sweep/cycle.rs
@@ -38,7 +38,7 @@ pub trait SweepCycle {
     /// operation is called in, and therefore falls outside of its scope.
     fn sweep_cycle(
         &self,
-        surface: Handle<Surface>,
+        bottom_surface: Handle<Surface>,
         top_surface: Handle<Surface>,
         color: Option<Color>,
         path: impl Into<Vector<3>>,
@@ -50,7 +50,7 @@ pub trait SweepCycle {
 impl SweepCycle for Cycle {
     fn sweep_cycle(
         &self,
-        surface: Handle<Surface>,
+        bottom_surface: Handle<Surface>,
         top_surface: Handle<Surface>,
         color: Option<Color>,
         path: impl Into<Vector<3>>,
@@ -68,7 +68,7 @@ impl SweepCycle for Cycle {
 
             let (side_face, top_half_edge) = bottom_half_edge.sweep_half_edge(
                 bottom_half_edge_next.start_vertex().clone(),
-                surface.clone(),
+                bottom_surface.clone(),
                 color,
                 path,
                 cache,
diff --git a/crates/fj-core/src/operations/sweep/face.rs b/crates/fj-core/src/operations/sweep/face.rs
index f06be7cc2..dd0f7454f 100644
--- a/crates/fj-core/src/operations/sweep/face.rs
+++ b/crates/fj-core/src/operations/sweep/face.rs
@@ -57,7 +57,7 @@ impl SweepFace for Handle<Face> {
                 core,
             )
             .all_faces()
-            .map(|side_face| side_face.insert(core));
+            .map(|face| face.insert(core));
 
         let mut faces = Vec::new();
         faces.push(bottom_face.clone());
diff --git a/crates/fj-core/src/operations/sweep/region.rs b/crates/fj-core/src/operations/sweep/region.rs
index b3be68d8b..bbdc3fda3 100644
--- a/crates/fj-core/src/operations/sweep/region.rs
+++ b/crates/fj-core/src/operations/sweep/region.rs
@@ -31,7 +31,7 @@ pub trait SweepRegion {
     /// operation's scope.
     fn sweep_region(
         &self,
-        surface: Handle<Surface>,
+        bottom_surface: Handle<Surface>,
         color: Option<Color>,
         path: impl Into<Vector<3>>,
         cache: &mut SweepCache,
@@ -42,7 +42,7 @@ pub trait SweepRegion {
 impl SweepRegion for Region {
     fn sweep_region(
         &self,
-        surface: Handle<Surface>,
+        bottom_surface: Handle<Surface>,
         color: Option<Color>,
         path: impl Into<Vector<3>>,
         cache: &mut SweepCache,
@@ -52,11 +52,11 @@ impl SweepRegion for Region {
 
         let mut faces = Vec::new();
 
-        let top_surface = surface.translate(path, core).insert(core);
+        let top_surface = bottom_surface.translate(path, core).insert(core);
 
         let top_exterior = sweep_cycle(
             self.exterior(),
-            surface.clone(),
+            bottom_surface.clone(),
             top_surface.clone(),
             color,
             &mut faces,
@@ -71,7 +71,7 @@ impl SweepRegion for Region {
             .map(|bottom_cycle| {
                 sweep_cycle(
                     bottom_cycle,
-                    surface.clone(),
+                    bottom_surface.clone(),
                     top_surface.clone(),
                     color,
                     &mut faces,