diff --git a/ArcFormats/MnoViolet/ImageDIF.cs b/ArcFormats/MnoViolet/ImageDIF.cs
index f711d09a..71ecf562 100644
--- a/ArcFormats/MnoViolet/ImageDIF.cs
+++ b/ArcFormats/MnoViolet/ImageDIF.cs
@@ -77,7 +77,7 @@ namespace GameRes.Formats.MnoViolet
                 return null;
             var files = VFS.GetFiles (base_name+".*");
             if (!files.Any())
-                throw new FileNotFoundException (string.Format ("Base image '{0}' not found"), base_name);
+                throw new FileNotFoundException (string.Format ("Base image '{0}' not found", base_name));
             var base_entry = files.First();
             using (var input = VFS.OpenSeekableStream (base_entry))
             {