diff --git a/index.php b/index.php
index 985b61e..60ce795 100755
--- a/index.php
+++ b/index.php
@@ -238,7 +238,7 @@
                 include $TEMPLATE . 'strings.php';
 
                 $email = $_POST["email"];
-                if (($CONFERENCE_REGISTRATION & ! (new DB($log))->mail_count($email)) || !ldap_mail_count($email)) {
+                if (($CONFERENCE_REGISTRATION && ! (new DB($log))->mail_count($email)) || !ldap_mail_count($email)) {
                     unset($_POST['email']);
                     $error = $error . $STRINGS->recover_email_not_registered;
                 }