diff --git a/db/migrate/20170403160742_create_sales.rb b/db/migrate/20170403160742_create_sales.rb
index ae806472..9deeb9b8 100644
--- a/db/migrate/20170403160742_create_sales.rb
+++ b/db/migrate/20170403160742_create_sales.rb
@@ -20,7 +20,7 @@ class CreateSales < ActiveRecord::Migration[5.1]
       t.decimal :rounding_adjustment, :precision => 10, :scale => 2, :null => false, :default => 0.00
       t.decimal :amount_received, :precision => 10, :scale => 2, :null => false, :default => 0.00
       t.decimal :amount_changed, :precision => 10, :scale => 2, :null => false, :default => 0.00
-      t.integer :shift_sale_id, :null => false
+      t.integer :shift_sale_id
       t.timestamps
     end
   end