diff --git a/src/ImageSharp/Formats/ImageFormatManager.cs b/src/ImageSharp/Formats/ImageFormatManager.cs
index 8b4e320c5a..eaf98a4a31 100644
--- a/src/ImageSharp/Formats/ImageFormatManager.cs
+++ b/src/ImageSharp/Formats/ImageFormatManager.cs
@@ -102,8 +102,6 @@ public class ImageFormatManager
     /// <returns><see langword="true"/> if a match is found; otherwise, <see langword="false"/></returns>
     public bool TryFindFormatByFileExtension(string extension, [NotNullWhen(true)] out IImageFormat? format)
     {
-        Guard.NotNullOrWhiteSpace(extension, nameof(extension));
-
         if (extension[0] == '.')
         {
             extension = extension[1..];