diff --git a/lib/SimpleSAML/Auth/LDAP.php b/lib/SimpleSAML/Auth/LDAP.php
index 08af6dacadd935c0c7d4149bdfc65f2dedff565d..d0416cc5bc48164dc59d9b2d4ea4e56bf691322d 100644
--- a/lib/SimpleSAML/Auth/LDAP.php
+++ b/lib/SimpleSAML/Auth/LDAP.php
@@ -34,7 +34,7 @@ class LDAP
     /**
      * LDAP link identifier.
      *
-     * @var resource
+     * @var resource|bool
      */
     protected $ldap = null;