diff --git a/db/migrate/20130828192526_fix_optimized_images_urls.rb b/db/migrate/20130828192526_fix_optimized_images_urls.rb
index 4e19bb907..c605b7b74 100644
--- a/db/migrate/20130828192526_fix_optimized_images_urls.rb
+++ b/db/migrate/20130828192526_fix_optimized_images_urls.rb
@@ -2,15 +2,15 @@ class FixOptimizedImagesUrls < ActiveRecord::Migration
   def up
     # `AddUrlToOptimizedImages` was wrongly computing the URLs. This fixes it!
     execute "UPDATE optimized_images
-             SET url = substring(oi.url from '^\/uploads\/[^/]+\/_optimized/[0-9a-f]{3}/[0-9a-f]{3}/[0-9a-f]{11}')
+             SET url = substring(oi.url from '^\\/uploads\\/[^/]+\\/_optimized\\/[0-9a-f]{3}\\/[0-9a-f]{3}\\/[0-9a-f]{11}')
                     || '_'
                     || oi.width
                     || 'x'
                     || oi.height
-                    || substring(oi.url from '\.\w{3,4}$')
+                    || substring(oi.url from '\\.\\w{3,4}$')
              FROM optimized_images oi
              WHERE optimized_images.id = oi.id
-               AND oi.url ~ '^\/uploads\/[^/]+\/_optimized\/[0-9a-f]{3}/[0-9a-f]{3}/[0-9a-f]{11}\.';"
+               AND oi.url ~ '^\\/uploads\\/[^/]+\\/_optimized\\/[0-9a-f]{3}\\/[0-9a-f]{3}\\/[0-9a-f]{11}\\.';"
   end
 
   def down