diff --git a/apps/myjobs/db/migrate/20160531150155_add_json_attrs_as_separate_cols_to_workflow.rb b/apps/myjobs/db/migrate/20160531150155_add_json_attrs_as_separate_cols_to_workflow.rb
index 13d2ae3c7..bab86f840 100644
--- a/apps/myjobs/db/migrate/20160531150155_add_json_attrs_as_separate_cols_to_workflow.rb
+++ b/apps/myjobs/db/migrate/20160531150155_add_json_attrs_as_separate_cols_to_workflow.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class AddJsonAttrsAsSeparateColsToWorkflow < ActiveRecord::Migration[4.2]
   class Workflow < ActiveRecord::Base
     # store :job_attrs, accessors: [ :name, :batch_host, :staged_dir, :script_name ], coder: JSON