diff --git a/src/ImageSharp/Formats/Ani/AniDecoderCore.cs b/src/ImageSharp/Formats/Ani/AniDecoderCore.cs
index ab79a14e0..d5507208b 100644
--- a/src/ImageSharp/Formats/Ani/AniDecoderCore.cs
+++ b/src/ImageSharp/Formats/Ani/AniDecoderCore.cs
@@ -21,7 +21,7 @@ namespace SixLabors.ImageSharp.Formats.Ani;
 
 internal class AniDecoderCore(DecoderOptions options) : ImageDecoderCore(options)
 {
-    private enum ListIconChunkType
+    private enum ListIconChunkType : byte
     {
         Ico = 1,
         Cur = 2,
diff --git a/src/ImageSharp/Formats/Ani/AniHeader.cs b/src/ImageSharp/Formats/Ani/AniHeader.cs
index 8f504c511..474aeb7a6 100644
--- a/src/ImageSharp/Formats/Ani/AniHeader.cs
+++ b/src/ImageSharp/Formats/Ani/AniHeader.cs
@@ -28,7 +28,7 @@ internal readonly struct AniHeader
 
     public static ref AniHeader Parse(ReadOnlySpan<byte> data) => ref Unsafe.As<byte, AniHeader>(ref MemoryMarshal.GetReference(data));
 
-    public void WriteTo(in Stream stream) => stream.Write(MemoryMarshal.AsBytes(MemoryMarshal.CreateReadOnlySpan(in this, 1)));
+    public void WriteTo(Stream stream) => stream.Write(MemoryMarshal.AsBytes(MemoryMarshal.CreateReadOnlySpan(in this, 1)));
 }
 
 /// <summary>