diff --git a/src/main.cpp b/src/main.cpp
index f88efe7b5..04a55b3dc 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -5768,6 +5768,7 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
         CBlockHeaderAndShortTxIDs cmpctblock;
         vRecv >> cmpctblock;
 
+        {
         LOCK(cs_main);
 
         if (mapBlockIndex.find(cmpctblock.header.hashPrevBlock) == mapBlockIndex.end()) {
@@ -5776,19 +5777,23 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
                 connman.PushMessage(pfrom, NetMsgType::GETHEADERS, chainActive.GetLocator(pindexBestHeader), uint256());
             return true;
         }
+        }
 
         CBlockIndex *pindex = NULL;
         CValidationState state;
-        if (!AcceptBlockHeader(cmpctblock.header, state, chainparams, &pindex)) {
+        if (!ProcessNewBlockHeaders({cmpctblock.header}, state, chainparams, &pindex)) {
             int nDoS;
             if (state.IsInvalid(nDoS)) {
-                if (nDoS > 0)
+                if (nDoS > 0) {
+                    LOCK(cs_main);
                     Misbehaving(pfrom->GetId(), nDoS);
+                }
                 LogPrintf("Peer %d sent us invalid header via cmpctblock\n", pfrom->id);
                 return true;
             }
         }
 
+        LOCK(cs_main);
         // If AcceptBlockHeader returned true, it set pindex
         assert(pindex);
         UpdateBlockAvailability(pfrom->GetId(), pindex->GetBlockHash());