diff --git a/defense.php b/defense.php
index f35a988..b734f3d 100644
--- a/defense.php
+++ b/defense.php
@@ -290,7 +290,7 @@ class defense extends rcube_plugin {
             die();
         }
         
-        if ($this->ban_httpstatus) && ($this->isBanned($this->ipaddr)) {
+        if (($this->ban_httpstatus) && ($this->isBanned($this->ipaddr))) {
             $this->debug("IP already banned");
             $this->sendForbiddenHeader();
         }