1 files changed, 2 insertions, 0 deletions
diff --git a/src/wallet/api/transaction_history.h b/src/wallet/api/transaction_history.h
index 171fd2210..1b6617ead 100644
--- a/src/wallet/api/transaction_history.h
+++ b/src/wallet/api/transaction_history.h
@@ -29,6 +29,7 @@
 // Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers
 
 #include "wallet/wallet2_api.h"
+#include <boost/thread/shared_mutex.hpp>
 
 namespace Bitmonero {
 
@@ -51,6 +52,7 @@ private:
     // TransactionHistory is responsible of memory management
     std::vector<TransactionInfo*> m_history;
     WalletImpl *m_wallet;
+    mutable boost::shared_mutex   m_historyMutex;
 };
 
 }