diff --git a/libraries/libmdb/mdb_stat.c b/libraries/libmdb/mdb_stat.c
index 6007510..97bd8d4 100644
--- a/libraries/libmdb/mdb_stat.c
+++ b/libraries/libmdb/mdb_stat.c
@@ -38,7 +38,7 @@ int main(int argc,char * argv[])
 		printf("mdb_env_open failed, error %d\n", rc);
 		goto env_close;
 	}
-	rc = mdb_txn_begin(env, NULL, 1, &txn);
+	rc = mdb_txn_begin(env, NULL, MDB_RDONLY, &txn);
 	if (rc) {
 		printf("mdb_txn_begin failed, error %d\n", rc);
 		goto env_close;
diff --git a/libraries/libmdb/mdb_stata.c b/libraries/libmdb/mdb_stata.c
index f8b2fe5..7cfebb4 100644
--- a/libraries/libmdb/mdb_stata.c
+++ b/libraries/libmdb/mdb_stata.c
@@ -36,7 +36,7 @@ int main(int argc,char * argv[])
 		printf("mdb_env_open failed, error %d\n", rc);
 		goto env_close;
 	}
-	rc = mdb_txn_begin(env, NULL, 1, &txn);
+	rc = mdb_txn_begin(env, NULL, MDB_RDONLY, &txn);
 	if (rc) {
 		printf("mdb_txn_begin failed, error %d\n", rc);
 		goto env_close;