diff --git a/public/app/plugins/datasource/opentsdb/datasource.js b/public/app/plugins/datasource/opentsdb/datasource.js
index 2a5ca425ea3..bac88117204 100644
--- a/public/app/plugins/datasource/opentsdb/datasource.js
+++ b/public/app/plugins/datasource/opentsdb/datasource.js
@@ -167,7 +167,7 @@ function (angular, _, kbn) {
     };
 
     OpenTSDBDatasource.prototype.testDatasource = function() {
-      return this.performSuggestQuery('cpu', 'metrics').then(function () {
+      return this._performSuggestQuery('cpu', 'metrics').then(function () {
         return { status: "success", message: "Data source is working", title: "Success" };
       });
     };