diff --git a/src/geometry/polyhedron_feature3d.rs b/src/geometry/polyhedron_feature3d.rs
index 83088fe..e88674e 100644
--- a/src/geometry/polyhedron_feature3d.rs
+++ b/src/geometry/polyhedron_feature3d.rs
@@ -64,8 +64,8 @@ impl PolyhedronFace {
     }
 
     pub fn transform_by(&mut self, iso: &Isometry<f32>) {
-        for v in &mut self.vertices[0..self.num_vertices] {
-            *v = iso * *v;
+        for p in &mut self.vertices[0..self.num_vertices] {
+            *p = iso * *p;
         }
     }