diff --git a/library/Icinga/Chart/Donut.php b/library/Icinga/Chart/Donut.php
index d139dd024..79230a6a6 100644
--- a/library/Icinga/Chart/Donut.php
+++ b/library/Icinga/Chart/Donut.php
@@ -385,7 +385,7 @@ class Donut
 
     protected function renderAttributes(array $attributes)
     {
-        $html = [];
+        $html = array();
 
         foreach ($attributes as $name => $value) {
             if ($value === null) {