diff --git a/src/blockchain_db/lmdb/db_lmdb.cpp b/src/blockchain_db/lmdb/db_lmdb.cpp
index 495f93bd..6d815c99 100644
--- a/src/blockchain_db/lmdb/db_lmdb.cpp
+++ b/src/blockchain_db/lmdb/db_lmdb.cpp
@@ -637,6 +637,7 @@ BlockchainLMDB::BlockchainLMDB(bool batch_transactions)
 
 void BlockchainLMDB::open(const std::string& filename)
 {
+  int mdb_flags = 0;
   LOG_PRINT_L3("BlockchainLMDB::" << __func__);
 
   if (m_open)
@@ -675,7 +676,7 @@ void BlockchainLMDB::open(const std::string& filename)
   size_t mapsize = 1LL << 34;
   if (auto result = mdb_env_set_mapsize(m_env, mapsize))
     throw0(DB_ERROR(std::string("Failed to set max memory map size: ").append(mdb_strerror(result)).c_str()));
-  if (auto result = mdb_env_open(m_env, filename.c_str(), 0, 0644))
+  if (auto result = mdb_env_open(m_env, filename.c_str(), mdb_flags, 0644))
     throw0(DB_ERROR(std::string("Failed to open lmdb environment: ").append(mdb_strerror(result)).c_str()));
 
   // get a read/write MDB_txn