diff --git a/examples/2d/bounding_2d.rs b/examples/2d/bounding_2d.rs
index f4c24e739432f..13387f366cf7b 100644
--- a/examples/2d/bounding_2d.rs
+++ b/examples/2d/bounding_2d.rs
@@ -105,22 +105,22 @@ fn render_shapes(mut gizmos: Gizmos, query: Query<(&Shape, &Transform)>) {
         let rotation = transform.rotation.to_euler(EulerRot::YXZ).2;
         let isometry = Isometry2d::new(translation, Rot2::radians(rotation));
         match shape {
-            Shape::Rectangle(r) => {
+            Shape::Rectangle(ref r) => {
                 gizmos.primitive_2d(r, isometry, color);
             }
-            Shape::Circle(c) => {
+            Shape::Circle(ref c) => {
                 gizmos.primitive_2d(c, isometry, color);
             }
-            Shape::Triangle(t) => {
+            Shape::Triangle(ref t) => {
                 gizmos.primitive_2d(t, isometry, color);
             }
-            Shape::Line(l) => {
+            Shape::Line(ref l) => {
                 gizmos.primitive_2d(l, isometry, color);
             }
-            Shape::Capsule(c) => {
+            Shape::Capsule(ref c) => {
                 gizmos.primitive_2d(c, isometry, color);
             }
-            Shape::Polygon(p) => {
+            Shape::Polygon(ref p) => {
                 gizmos.primitive_2d(p, isometry, color);
             }
         }
@@ -301,8 +301,8 @@ fn ray_cast_system(
 
     for (volume, mut intersects) in volumes.iter_mut() {
         let toi = match volume {
-            CurrentVolume::Aabb(a) => ray_cast.aabb_intersection_at(a),
-            CurrentVolume::Circle(c) => ray_cast.circle_intersection_at(c),
+            CurrentVolume::Aabb(ref a) => ray_cast.aabb_intersection_at(a),
+            CurrentVolume::Circle(ref c) => ray_cast.circle_intersection_at(c),
         };
         **intersects = toi.is_some();
         if let Some(toi) = toi {
@@ -388,8 +388,8 @@ fn aabb_intersection_system(
 
     for (volume, mut intersects) in volumes.iter_mut() {
         let hit = match volume {
-            CurrentVolume::Aabb(a) => aabb.intersects(a),
-            CurrentVolume::Circle(c) => aabb.intersects(c),
+            CurrentVolume::Aabb(ref a) => aabb.intersects(a),
+            CurrentVolume::Circle(ref c) => aabb.intersects(c),
         };
 
         **intersects = hit;