diff --git a/plugins/kolab_auth/kolab_auth.php b/plugins/kolab_auth/kolab_auth.php
index 926c5065..e223adbc 100644
--- a/plugins/kolab_auth/kolab_auth.php
+++ b/plugins/kolab_auth/kolab_auth.php
@@ -64,7 +64,6 @@ class kolab_auth extends rcube_plugin
         // Enable debug logs (per-user), when logged as another user
         if (!empty($_SESSION['kolab_auth_admin']) && $rcmail->config->get('kolab_auth_auditlog')) {
             $rcmail->config->set('debug_level', 1);
-            $rcmail->config->set('devel_mode', true);
             $rcmail->config->set('smtp_log', true);
             $rcmail->config->set('log_logins', true);
             $rcmail->config->set('log_session', true);