diff --git a/src/validation.h b/src/validation.h
--- a/src/validation.h
+++ b/src/validation.h
@@ -796,7 +796,8 @@
 
     bool ActivateBestChain(
         const Config &config, BlockValidationState &state,
-        std::shared_ptr<const CBlock> pblock = std::shared_ptr<const CBlock>());
+        std::shared_ptr<const CBlock> pblock = std::shared_ptr<const CBlock>())
+        LOCKS_EXCLUDED(cs_main);
 
     /**
      * If a block header hasn't already been seen, call CheckBlockHeader on it,
@@ -835,9 +836,10 @@
      * A finalized block can not be reorged in any way.
      */
     bool FinalizeBlock(const Config &config, BlockValidationState &state,
-                       CBlockIndex *pindex);
+                       CBlockIndex *pindex) LOCKS_EXCLUDED(cs_main);
     bool UnwindBlock(const Config &config, BlockValidationState &state,
-                     CBlockIndex *pindex, bool invalidate);
+                     CBlockIndex *pindex, bool invalidate)
+        LOCKS_EXCLUDED(cs_main);
     void ResetBlockFailureFlags(CBlockIndex *pindex)
         EXCLUSIVE_LOCKS_REQUIRED(cs_main);
     template <typename F>
@@ -918,11 +920,11 @@
 
 /** Mark a block as invalid. */
 bool InvalidateBlock(const Config &config, BlockValidationState &state,
-                     CBlockIndex *pindex);
+                     CBlockIndex *pindex) LOCKS_EXCLUDED(cs_main);
 
 /** Park a block. */
 bool ParkBlock(const Config &config, BlockValidationState &state,
-               CBlockIndex *pindex);
+               CBlockIndex *pindex) LOCKS_EXCLUDED(cs_main);
 
 /** Remove invalidity status from a block and its descendants. */
 void ResetBlockFailureFlags(CBlockIndex *pindex)