diff --git a/src/datasource-zabbix/migrations.js b/src/datasource-zabbix/migrations.js
index 4343149..538d843 100644
--- a/src/datasource-zabbix/migrations.js
+++ b/src/datasource-zabbix/migrations.js
@@ -25,8 +25,6 @@ export function migrateFrom2To3version(target) {
   target.application.isRegex = target.application.name === "*";
   target.item.filter = target.item.name === "All" ? convertToRegex(target.itemFilter) : target.item.name;
   target.item.isRegex = target.item.name === "All";
-  target.functions = [];
-  target.refId = target.refId ? target.refId : "A";
   return target;
 }
 
diff --git a/src/datasource-zabbix/query.controller.js b/src/datasource-zabbix/query.controller.js
index daeda87..a6fd9bf 100644
--- a/src/datasource-zabbix/query.controller.js
+++ b/src/datasource-zabbix/query.controller.js
@@ -53,6 +53,7 @@ export class ZabbixQueryController extends QueryCtrl {
         application: { filter: "" },
         item: { filter: "" },
         functions: [],
+        refId: "A"
       };
       _.defaults(target, targetDefaults);