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diff --git a/db/post_migrate/20170408033905_remove_old_cache_directories.rb b/db/post_migrate/20170408033905_remove_old_cache_directories.rb
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+++ b/db/post_migrate/20170408033905_remove_old_cache_directories.rb
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+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+# Remove all files from old custom carrierwave's cache directories.
+# See https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9466
+
+class RemoveOldCacheDirectories < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    # FileUploader cache.
+    FileUtils.rm_rf(Dir[Rails.root.join('public', 'uploads', 'tmp', '*')])
+  end
+
+  def down
+    # Old cache is not supposed to be recoverable.
+    # So the down method is empty.
+  end
+end