diff --git a/src/ImageSharp/Processing/Transforms/TransformHelpers.cs b/src/ImageSharp/Processing/Transforms/TransformHelpers.cs
index 6f9560a9f..419c1c13d 100644
--- a/src/ImageSharp/Processing/Transforms/TransformHelpers.cs
+++ b/src/ImageSharp/Processing/Transforms/TransformHelpers.cs
@@ -10,7 +10,7 @@ namespace SixLabors.ImageSharp
     /// <summary>
     /// Contains helper methods for working with affine transforms
     /// </summary>
-    public class TransformHelpers
+    internal class TransformHelpers
     {
         /// <summary>
         /// Returns the bounding <see cref="Rectangle"/> relative to the source for the given transformation matrix.