diff --git a/servers/slapd/back-mdb/config.c b/servers/slapd/back-mdb/config.c
index 589d42d2cf..2eef8f0782 100644
--- a/servers/slapd/back-mdb/config.c
+++ b/servers/slapd/back-mdb/config.c
@@ -124,6 +124,12 @@ static slap_verbmasks mdb_envflags[] = {
 	{ BER_BVC("writemap"),	MDB_WRITEMAP },
 	{ BER_BVC("mapasync"),	MDB_MAPASYNC },
 	{ BER_BVC("nordahead"),	MDB_NORDAHEAD },
+#ifdef MDB_LIFORECLAIM
+	{ BER_BVC("lifo"),		MDB_LIFORECLAIM },
+#endif
+#ifdef MDB_COALESCE
+	{ BER_BVC("coalesce"),	MDB_COALESCE },
+#endif
 	{ BER_BVNULL, 0 }
 };