diff --git a/Src/Noesis/Core/Src/Core/RenderDevice.cs b/Src/Noesis/Core/Src/Core/RenderDevice.cs
index 93a145d..db35a74 100644
--- a/Src/Noesis/Core/Src/Core/RenderDevice.cs
+++ b/Src/Noesis/Core/Src/Core/RenderDevice.cs
@@ -333,7 +333,9 @@ public static Shader.Vertex.Format.Attr.Type.Enum TypeForAttr(Shader.Vertex.Form
                 1, 3, 1, 1, 0, 4, 2, 2
             };
 
-            return (Shader.Vertex.Format.Attr.Type.Enum)map[(int)attr];
+            int index = Array.IndexOf(Enum.GetValues(typeof(Shader.Vertex.Format.Attr.Enum)), attr);
+
+            return (Shader.Vertex.Format.Attr.Type.Enum)map[index];
         }
 
         /// <summary>