diff --git a/libraries/libldap_r/tpool.c b/libraries/libldap_r/tpool.c
index 06124de96c..6e3d81b3b2 100644
--- a/libraries/libldap_r/tpool.c
+++ b/libraries/libldap_r/tpool.c
@@ -528,6 +528,7 @@ ldap_pvt_thread_pool_destroy ( ldap_pvt_thread_pool_t *tpool, int run_pending )
 	ldap_pvt_thread_cond_destroy(&pool->ltp_cond);
 	ldap_pvt_thread_mutex_destroy(&pool->ltp_mutex);
 	LDAP_FREE(pool);
+	*tpool = NULL;
 	ldap_int_has_thread_pool = 0;
 	return(0);
 }