diff --git a/src/main.cpp b/src/main.cpp
index 51b719128..ec52f1a6d 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -65,7 +65,7 @@ CCriticalSection cs_main;
 BlockMap mapBlockIndex;
 CChain chainActive;
 CBlockIndex *pindexBestHeader = NULL;
-static int64_t nTimeBestReceived = 0;
+static std::atomic<int64_t> nTimeBestReceived(0); // Used only to inform the wallet of when we last received a block
 CWaitableCriticalSection csBestBlock;
 CConditionVariable cvBlockChange;
 int nScriptCheckThreads = 0;