diff --git a/src/rpc/blockchain.cpp b/src/rpc/blockchain.cpp
index 7fb9ff2eaf0..1169446eff3 100644
--- a/src/rpc/blockchain.cpp
+++ b/src/rpc/blockchain.cpp
@@ -1583,15 +1583,15 @@ static UniValue invalidateblock(const JSONRPCRequest& request)
     uint256 hash(ParseHashV(request.params[0], "blockhash"));
     CValidationState state;
 
+    CBlockIndex* pblockindex;
     {
         LOCK(cs_main);
-        CBlockIndex* pblockindex = LookupBlockIndex(hash);
+        pblockindex = LookupBlockIndex(hash);
         if (!pblockindex) {
             throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Block not found");
         }
-
-        InvalidateBlock(state, Params(), pblockindex);
     }
+    InvalidateBlock(state, Params(), pblockindex);
 
     if (state.IsValid()) {
         ActivateBestChain(state, Params());
diff --git a/src/validation.cpp b/src/validation.cpp
index 1de2cda5cd6..dd4436c9cf9 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -177,7 +177,7 @@ public:
 
     // Manual block validity manipulation:
     bool PreciousBlock(CValidationState& state, const CChainParams& params, CBlockIndex* pindex) LOCKS_EXCLUDED(cs_main);
-    bool InvalidateBlock(CValidationState& state, const CChainParams& chainparams, CBlockIndex* pindex) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
+    bool InvalidateBlock(CValidationState& state, const CChainParams& chainparams, CBlockIndex* pindex);
     void ResetBlockFailureFlags(CBlockIndex* pindex) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
 
     bool ReplayBlocks(const CChainParams& params, CCoinsView* view);
@@ -2789,7 +2789,7 @@ bool PreciousBlock(CValidationState& state, const CChainParams& params, CBlockIn
 
 bool CChainState::InvalidateBlock(CValidationState& state, const CChainParams& chainparams, CBlockIndex *pindex)
 {
-    AssertLockHeld(cs_main);
+    LOCK(cs_main);
 
     // We first disconnect backwards and then mark the blocks as invalid.
     // This prevents a case where pruned nodes may fail to invalidateblock
diff --git a/src/validation.h b/src/validation.h
index 1975846b69f..65a378d8bab 100644
--- a/src/validation.h
+++ b/src/validation.h
@@ -448,7 +448,7 @@ CBlockIndex* FindForkInGlobalIndex(const CChain& chain, const CBlockLocator& loc
 bool PreciousBlock(CValidationState& state, const CChainParams& params, CBlockIndex *pindex) LOCKS_EXCLUDED(cs_main);
 
 /** Mark a block as invalid. */
-bool InvalidateBlock(CValidationState& state, const CChainParams& chainparams, CBlockIndex* pindex) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
+bool InvalidateBlock(CValidationState& state, const CChainParams& chainparams, CBlockIndex* pindex);
 
 /** Remove invalidity status from a block and its descendants. */
 void ResetBlockFailureFlags(CBlockIndex* pindex) EXCLUSIVE_LOCKS_REQUIRED(cs_main);