diff --git a/servers/slapd/back-sql/init.c b/servers/slapd/back-sql/init.c
index f78b0c7627..678d106d41 100644
--- a/servers/slapd/back-sql/init.c
+++ b/servers/slapd/back-sql/init.c
@@ -39,6 +39,9 @@ sql_back_initialize(
 #if 0 /* needs improvements */
 		LDAP_CONTROL_NOOP,
 #endif
+#ifdef LDAP_CONTROL_X_TREE_DELETE
+		LDAP_CONTROL_X_TREE_DELETE,
+#endif /* LDAP_CONTROL_X_TREE_DELETE */
 #ifdef LDAP_CONTROL_VALUESRETURNFILTER
  		LDAP_CONTROL_VALUESRETURNFILTER,
 #endif /* LDAP_CONTROL_VALUESRETURNFILTER */