diff --git a/src/bitcoin-chainstate.cpp b/src/bitcoin-chainstate.cpp
index f93197350d..72b8fefcc7 100644
--- a/src/bitcoin-chainstate.cpp
+++ b/src/bitcoin-chainstate.cpp
@@ -256,7 +256,7 @@ epilogue:
     }
     GetMainSignals().UnregisterBackgroundSignalScheduler();
 
-    UnloadBlockIndex(nullptr, chainman);
+    WITH_LOCK(::cs_main, UnloadBlockIndex(nullptr, chainman));
 
     init::UnsetGlobals();
 }