diff --git a/database/migrations/2016_01_04_175228_create_vendors_table.php b/database/migrations/2016_01_04_175228_create_vendors_table.php
index b1e3f7b4e8..1295748b08 100644
--- a/database/migrations/2016_01_04_175228_create_vendors_table.php
+++ b/database/migrations/2016_01_04_175228_create_vendors_table.php
@@ -117,6 +117,10 @@ class CreateVendorsTable extends Migration
         Schema::table('invoices', function (Blueprint $table) {
             $table->boolean('has_expenses')->default(false);
         });
+
+        Schema::table('payment_terms', function (Blueprint $table) {
+            $table->unique(array('account_id', 'public_id'));
+        });
     }
 
     /**