diff --git a/libraries/libmdb/mtest.c b/libraries/libmdb/mtest.c
index bc3df268c9..f99beb82a0 100644
--- a/libraries/libmdb/mtest.c
+++ b/libraries/libmdb/mtest.c
@@ -25,7 +25,7 @@ int main(int argc,char * argv[])
 	    }
     
 		rc = mdbenv_create(&env, 10485760);
-		rc = mdbenv_open(env, "./testdb", MDB_FIXEDMAP, 0664);
+		rc = mdbenv_open(env, "./testdb", MDB_FIXEDMAP|MDB_NOSYNC, 0664);
 		rc = mdb_txn_begin(env, 0, &txn);
 		rc = mdb_open(env, txn, NULL, 0, &db);