1 files changed, 4 insertions, 0 deletions
diff --git a/src/cryptonote_core/blockchain.h b/src/cryptonote_core/blockchain.h
index 4423199de..70f616544 100644
--- a/src/cryptonote_core/blockchain.h
+++ b/src/cryptonote_core/blockchain.h
@@ -1006,6 +1006,10 @@ namespace cryptonote
     std::vector<difficulty_type> m_difficulties;
     uint64_t m_timestamps_and_difficulties_height;
 
+    epee::critical_section m_difficulty_lock;
+    crypto::hash m_difficulty_for_next_block_top_hash;
+    difficulty_type m_difficulty_for_next_block;
+
     boost::asio::io_service m_async_service;
     boost::thread_group m_async_pool;
     std::unique_ptr<boost::asio::io_service::work> m_async_work_idle;