diff --git a/contrib/grafana.php b/contrib/grafana.php
index e43f919de..9207f8ced 100644
--- a/contrib/grafana.php
+++ b/contrib/grafana.php
@@ -62,7 +62,6 @@
 
     Httpie::post($config['url'])
         ->header('Authorization', 'Bearer ' . $config['token'])
-        ->header('Content-type', 'application/json')
         ->jsonBody($params)
         ->send();
 });