diff --git a/app/models/uploaded_file.rb b/app/models/uploaded_file.rb
index 4ce2b26..a17ec93 100644
--- a/app/models/uploaded_file.rb
+++ b/app/models/uploaded_file.rb
@@ -10,7 +10,7 @@ class UploadedFile < Article
   #  :min_size => 2.megabytes
   #  :max_size => 5.megabytes
   has_attachment :storage => :file_system,
-    :thumbnails => { :icon => [24,24], :thumb => '130x130>', :display => [640,480] },
+    :thumbnails => { :icon => [24,24], :thumb => '130x130>', :display => '640X480>' },
     :thumbnail_class => Thumbnail,
     :max_size => 5.megabytes
 
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libgit2 0.21.2