diff --git a/src/validation.cpp b/src/validation.cpp
index b71e8daf978..3ae2292c3be 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -4316,6 +4316,7 @@ bool RewindBlockIndex(const CChainParams& params) {
         return false;
     }
 
+    LOCK(cs_main);
     if (::ChainActive().Tip() != nullptr) {
         // FlushStateToDisk can possibly read ::ChainActive(). Be conservative
         // and skip it here, we're about to -reindex-chainstate anyway, so