diff --git a/src/net.h b/src/net.h
index 4bbcfac88..566284c70 100644
--- a/src/net.h
+++ b/src/net.h
@@ -628,7 +628,7 @@ protected:
 
 public:
     uint256 hashContinue;
-    int nStartingHeight;
+    std::atomic<int> nStartingHeight;
 
     // flood relay
     std::vector<CAddress> vAddrToSend;