diff --git a/src/txmempool.h b/src/txmempool.h
--- a/src/txmempool.h
+++ b/src/txmempool.h
@@ -699,12 +699,6 @@
         return mapTx.count(hash) != 0;
     }
 
-    bool exists(const COutPoint &outpoint) const {
-        LOCK(cs);
-        auto it = mapTx.find(outpoint.GetTxId());
-        return it != mapTx.end() && outpoint.GetN() < it->GetTx().vout.size();
-    }
-
     CTransactionRef get(const uint256 &hash) const;
     TxMempoolInfo info(const uint256 &hash) const;
     std::vector<TxMempoolInfo> infoAll() const;