diff --git a/program/include/rcmail_action.php b/program/include/rcmail_action.php
index eaec16b154c..21281bcc7fe 100644
--- a/program/include/rcmail_action.php
+++ b/program/include/rcmail_action.php
@@ -168,6 +168,7 @@ public static function quota_set_env()
         // Return early if the server doesn't support quotas anyway.
         if ($quota === false) {
             $rcmail->output->set_env('quota', false);
+            return;
         }
         $zero_as_unlimited = (bool) $rcmail->config->get('quota_zero_as_unlimited');
         // Show the quota display only if it's not unlimited.