diff --git a/src/txmempool.h b/src/txmempool.h
--- a/src/txmempool.h
+++ b/src/txmempool.h
@@ -626,9 +626,10 @@
     // and any other callers may break wallet's in-mempool tracking (due to
     // lack of CValidationInterface::TransactionAddedToMempool callbacks).
     void addUnchecked(const uint256 &hash, const CTxMemPoolEntry &entry)
-        EXCLUSIVE_LOCKS_REQUIRED(cs);
+        EXCLUSIVE_LOCKS_REQUIRED(cs, cs_main);
     void addUnchecked(const uint256 &hash, const CTxMemPoolEntry &entry,
-                      setEntries &setAncestors) EXCLUSIVE_LOCKS_REQUIRED(cs);
+                      setEntries &setAncestors)
+        EXCLUSIVE_LOCKS_REQUIRED(cs, cs_main);
 
     void removeRecursive(
         const CTransaction &tx,
@@ -686,7 +687,8 @@
      * Note: txidsToUpdate should be the set of transactions from the
      * disconnected block that have been accepted back into the mempool.
      */
-    void UpdateTransactionsFromBlock(const std::vector<TxId> &txidsToUpdate);
+    void UpdateTransactionsFromBlock(const std::vector<TxId> &txidsToUpdate)
+        EXCLUSIVE_LOCKS_REQUIRED(cs_main);
 
     /**
      * Try to calculate all in-mempool ancestors of entry.
@@ -751,7 +753,7 @@
     void GetTransactionAncestry(const uint256 &txid, size_t &ancestors,
                                 size_t &descendants) const;
 
-    unsigned long size() {
+    unsigned long size() const {
         LOCK(cs);
         return mapTx.size();
     }