diff --git a/Engine.Physics2D/Primitives/Shape.cs b/Engine.Physics2D/Primitives/Shape.cs
index 231e114..3d1dc87 100644
--- a/Engine.Physics2D/Primitives/Shape.cs
+++ b/Engine.Physics2D/Primitives/Shape.cs
@@ -7,7 +7,7 @@ namespace Syntriax.Engine.Physics2D.Primitives;
 
 public record Shape(IList<Vector2D> Vertices)
 {
-    public Vector2D this[int index] => Vertices[index];
+    public Vector2D this[Index index] => Vertices[index];
 
     public static Triangle GetSuperTriangle(Shape shape)
     {