diff --git a/contrib/grafana.php b/contrib/grafana.php
index eba5c6aa3..9c93dfd4a 100644
--- a/contrib/grafana.php
+++ b/contrib/grafana.php
@@ -61,7 +61,6 @@
 
     Httpie::post($config['url'])
         ->header('Authorization', 'Bearer ' . $config['token'])
-        ->header('Content-type', 'application/json')
         ->jsonBody($params)
         ->send();
 });