diff --git a/Image.Convert/Program.cs b/Image.Convert/Program.cs
index 2604b96f..6895f9ea 100644
--- a/Image.Convert/Program.cs
+++ b/Image.Convert/Program.cs
@@ -38,7 +38,7 @@ namespace GARbro
 
         ImageFormat FindFormat (string format)
         {
-            var range = FormatCatalog.Instance.LookupTag<ImageFormat> (format);
+            var range = FormatCatalog.Instance.LookupExtension<ImageFormat> (format);
             return range.FirstOrDefault();
         }