diff --git a/PveTeam.Math/Transform.cs b/PveTeam.Math/Transform.cs
index 83c5bf3..7817df2 100644
--- a/PveTeam.Math/Transform.cs
+++ b/PveTeam.Math/Transform.cs
@@ -5,7 +5,7 @@ using System.Text;
 
 namespace PveTeam.Mathematics
 {
-    public class Transform
+    public struct Transform
     {
         public static Transform Identity => Matrix4x4.Identity;
 
diff --git a/PveTeam.Math/TransformD.cs b/PveTeam.Math/TransformD.cs
index cbcdd15..c5e22df 100644
--- a/PveTeam.Math/TransformD.cs
+++ b/PveTeam.Math/TransformD.cs
@@ -1,6 +1,6 @@
 namespace PveTeam.Mathematics
 {
-    public class TransformD
+    public struct TransformD
     {
         private Matrix4x4D _backingMatrix;