diff --git a/src/ImageSharp/Formats/Png/Zlib/Adler32.cs b/src/ImageSharp/Formats/Png/Zlib/Adler32.cs
index 163d4cbcf..534aba8f5 100644
--- a/src/ImageSharp/Formats/Png/Zlib/Adler32.cs
+++ b/src/ImageSharp/Formats/Png/Zlib/Adler32.cs
@@ -63,7 +63,7 @@ namespace SixLabors.ImageSharp.Formats.Png.Zlib
             }
 
 #if SUPPORTS_RUNTIME_INTRINSICS
-            if (Sse3.IsSupported && buffer.Length >= MinBufferSize)
+            if (Ssse3.IsSupported && buffer.Length >= MinBufferSize)
             {
                 return CalculateSse(adler, buffer);
             }