diff --git a/plugins/kolab_auth/kolab_auth.php b/plugins/kolab_auth/kolab_auth.php
index e223adbc..fadd3d2b 100644
--- a/plugins/kolab_auth/kolab_auth.php
+++ b/plugins/kolab_auth/kolab_auth.php
@@ -768,6 +768,17 @@ class kolab_auth extends rcube_plugin
         return self::$ldap;
     }
 
+    /**
+     * Close LDAP connection
+     */
+    public static function ldap_close()
+    {
+        if (self::$ldap) {
+            self::$ldap->close();
+            self::$ldap = null;
+        }
+    }
+
     /**
      * Parses LDAP DN string with replacing supported variables.
      * See kolab_auth_ldap::parse_vars()