diff --git a/libraries/libldap/open.c b/libraries/libldap/open.c
index d627e8323d..b4d22d7be6 100644
--- a/libraries/libldap/open.c
+++ b/libraries/libldap/open.c
@@ -550,6 +550,7 @@ ldap_int_check_async_open( LDAP *ld, ber_socket_t sd )
 		break;
 
 	default:
+		ld->ld_errno = LDAP_CONNECT_ERROR;
 		return -1;
 
 	case -2: