diff --git a/src/Kdyby/ElasticSearch/Diagnostics/Panel.php b/src/Kdyby/ElasticSearch/Diagnostics/Panel.php
index eebcd36..112c8f0 100644
--- a/src/Kdyby/ElasticSearch/Diagnostics/Panel.php
+++ b/src/Kdyby/ElasticSearch/Diagnostics/Panel.php
@@ -244,8 +244,8 @@ public static function renderException($e = NULL)
 	public function register(Kdyby\ElasticSearch\Client $client)
 	{
 		$this->client = $client;
-		$client->onSuccess[] = $this->success;
-		$client->onError[] = $this->failure;
+		$client->onSuccess[] = [$this, 'success'];
+		$client->onError[] = [$this, 'failure'];
 
 		Debugger::getBar()->addPanel($this);
 	}