1 files changed, 1 insertions, 1 deletions
diff --git a/src/validation.cpp b/src/validation.cpp
index de9c0d96db..dbdc1afb35 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -152,7 +152,7 @@ private:
 
 public:
     CChain chainActive;
-    BlockMap mapBlockIndex;
+    BlockMap mapBlockIndex GUARDED_BY(cs_main);
     std::multimap<CBlockIndex*, CBlockIndex*> mapBlocksUnlinked;
     CBlockIndex *pindexBestInvalid = nullptr;