diff --git a/libraries/liblmdb/mdb.c b/libraries/liblmdb/mdb.c
index 5423575..78c2c35 100644
--- a/libraries/liblmdb/mdb.c
+++ b/libraries/liblmdb/mdb.c
@@ -2586,7 +2586,7 @@ mdb_txn_renew0(MDB_txn *txn)
 	int rc, new_notls = 0;
 
 	if (txn->mt_flags & MDB_TXN_RDONLY) {
-		txn->mt_flags &= MDB_TXN_BEGIN_FLAGS;
+		txn->mt_flags = MDB_TXN_RDONLY;
 		/* Setup db info */
 		txn->mt_numdbs = env->me_numdbs;
 		txn->mt_dbxs = env->me_dbxs;	/* mostly static anyway */