diff --git a/src/ImageSharp/Formats/Png/PngDecoderCore.cs b/src/ImageSharp/Formats/Png/PngDecoderCore.cs
index 73edd55b7..4ed3fcecb 100644
--- a/src/ImageSharp/Formats/Png/PngDecoderCore.cs
+++ b/src/ImageSharp/Formats/Png/PngDecoderCore.cs
@@ -577,7 +577,7 @@ namespace ImageSharp.Formats
         {
             TPixel color = default(TPixel);
             BufferSpan<TPixel> pixelBuffer = pixels.GetRowSpan(this.currentRow);
-            BufferSpan<byte> scanlineBuffer = new BufferSpan<byte>(defilteredScanline);
+            BufferSpan<byte> scanlineBuffer = new BufferSpan<byte>(defilteredScanline, 1);
             switch (this.PngColorType)
             {
                 case PngColorType.Grayscale: