diff --git a/setup/db/create-schema.sql b/setup/db/create-schema.sql
index d81036cbb6e..0abf70a611b 100755
--- a/setup/db/create-schema.sql
+++ b/setup/db/create-schema.sql
@@ -1423,7 +1423,7 @@ CREATE TABLE `cloud`.`op_vm_ruleset_log` (
   `created` datetime NOT NULL COMMENT 'time the entry was requested',
   `logsequence` bigint unsigned  COMMENT 'seq number to be sent to agent, uniquely identifies ruleset update',
   PRIMARY KEY (`id`),
-  INDEX `i_op_vm_ruleset_log__instance_id`(`instance_id`)
+  UNIQUE `i_op_vm_ruleset_log__instance_id`(`instance_id`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
 
 CREATE TABLE `cloud`.`instance_group` (