diff --git a/src/ImageSharp/Formats/Webp/Chunks/WebpVp8X.cs b/src/ImageSharp/Formats/Webp/Chunks/WebpVp8X.cs
index 491f716500..7cec7c1db8 100644
--- a/src/ImageSharp/Formats/Webp/Chunks/WebpVp8X.cs
+++ b/src/ImageSharp/Formats/Webp/Chunks/WebpVp8X.cs
@@ -123,7 +123,10 @@ public void WriteTo(Stream stream)
         long pos = RiffHelper.BeginWriteChunk(stream, (uint)WebpChunkType.Vp8X);
 
         stream.WriteByte(flags);
-        stream.Position += 3; // Reserved bytes
+
+        Span<byte> reserved = stackalloc byte[3];
+        stream.Write(reserved);
+
         WebpChunkParsingUtils.WriteUInt24LittleEndian(stream, this.Width - 1);
         WebpChunkParsingUtils.WriteUInt24LittleEndian(stream, this.Height - 1);