diff --git a/db/migrate/20160901131628_add_pinfirmable_columns_to_resource.rb b/db/migrate/20160901131628_add_pinfirmable_columns_to_resource.rb
index 8afd529..f2dcefa 100644
--- a/db/migrate/20160901131628_add_pinfirmable_columns_to_resource.rb
+++ b/db/migrate/20160901131628_add_pinfirmable_columns_to_resource.rb
@@ -1,8 +1,10 @@
 class AddPinfirmableColumnsToResource < ActiveRecord::Migration[5.0]
   def change
     model = (ENV["MODEL"] || "user").downcase.pluralize.to_sym
-    add_column model, :pinfirmable_pin, :string
-    add_column model, :pinfirmable_tries, :integer, default: 0
-    add_column model, :pinfirmable_lockout, :datetime, default: nil
+    unless column_exists?(model, :pinfirmable_pin)
+      add_column model, :pinfirmable_pin, :string
+      add_column model, :pinfirmable_tries, :integer, default: 0
+      add_column model, :pinfirmable_lockout, :datetime, default: nil
+    end
   end
 end