diff --git a/manifests/alertmanager.pp b/manifests/alertmanager.pp
index 9cc2102e..24caaa86 100644
--- a/manifests/alertmanager.pp
+++ b/manifests/alertmanager.pp
@@ -189,6 +189,7 @@
     ensure  => 'directory',
     owner   => 'root',
     group   => $group,
+    mode    => '0750',
     purge   => $purge_config_dir,
     recurse => $purge_config_dir,
   }