diff --git a/setup/db/create-schema.sql b/setup/db/create-schema.sql
index 8398d8735ea..d6d26a6f173 100755
--- a/setup/db/create-schema.sql
+++ b/setup/db/create-schema.sql
@@ -563,7 +563,9 @@ CREATE TABLE `cloud`.`op_dc_vnet_alloc` (
     PRIMARY KEY (`id`),
     UNIQUE `i_op_dc_vnet_alloc__vnet__data_center_id__account_id`(`vnet`, `data_center_id`, `account_id`),
     INDEX `i_op_dc_vnet_alloc__dc_taken`(`data_center_id`, `taken`),
-    UNIQUE `i_op_dc_vnet_alloc__vnet__data_center_id`(`vnet`, `data_center_id`)
+    UNIQUE `i_op_dc_vnet_alloc__vnet__data_center_id`(`vnet`, `data_center_id`),
+	CONSTRAINT `fk_op_dc_vnet_alloc__data_center_id` FOREIGN KEY (`data_center_id`) REFERENCES `data_center`(`id`) ON DELETE CASCADE,
+	CONSTRAINT `fk_op_dc_vnet_alloc__physical_network_id` FOREIGN KEY (`physical_network_id`) REFERENCES `physical_network`(`id`) ON DELETE CASCADE
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
 
 CREATE TABLE `cloud`.`firewall_rules` (