diff --git a/app/models/optimized_image.rb b/app/models/optimized_image.rb
index 08ec00945..b49a2e990 100644
--- a/app/models/optimized_image.rb
+++ b/app/models/optimized_image.rb
@@ -80,7 +80,7 @@ class OptimizedImage < ActiveRecord::Base
 
   def self.resize(from, to, width, height, allow_animation=false)
     # NOTE: ORDER is important!
-    instructions = if allow_animation
+    instructions = if allow_animation && from =~ /\.GIF$/i
       %W{
         #{from}
         -coalesce