diff --git a/plugins/datasource-zabbix/queryCtrl.js b/plugins/datasource-zabbix/queryCtrl.js
index 3c19720..faa02a1 100644
--- a/plugins/datasource-zabbix/queryCtrl.js
+++ b/plugins/datasource-zabbix/queryCtrl.js
@@ -280,7 +280,7 @@ define([
 
         $scope.moveAliasFuncLast();
 
-        if (!newFunc.params.length && newFunc.added) {
+        if (newFunc.params.length && newFunc.added) {
           $scope.targetChanged();
         }
       };