diff --git a/src/miner.h b/src/miner.h
--- a/src/miner.h
+++ b/src/miner.h
@@ -98,7 +98,7 @@
         if (a->GetCountWithAncestors() != b->GetCountWithAncestors()) {
             return a->GetCountWithAncestors() < b->GetCountWithAncestors();
         }
-        return CTxMemPool::CompareIteratorByHash()(a, b);
+        return CTxMemPool::CompareIteratorById()(a, b);
     }
 };
 
diff --git a/src/txmempool.h b/src/txmempool.h
--- a/src/txmempool.h
+++ b/src/txmempool.h
@@ -215,7 +215,7 @@
     const LockPoints &lp;
 };
 
-// extracts a transaction hash from CTxMemPoolEntry or CTransactionRef
+// extracts a transaction id from CTxMemPoolEntry or CTransactionRef
 struct mempoolentry_txid {
     typedef TxId result_type;
     result_type operator()(const CTxMemPoolEntry &entry) const {
@@ -557,12 +557,12 @@
     //!< All tx hashes/entries in mapTx, in random order
     std::vector<std::pair<TxHash, txiter>> vTxHashes;
 
-    struct CompareIteratorByHash {
+    struct CompareIteratorById {
         bool operator()(const txiter &a, const txiter &b) const {
             return a->GetTx().GetId() < b->GetTx().GetId();
         }
     };
-    typedef std::set<txiter, CompareIteratorByHash> setEntries;
+    typedef std::set<txiter, CompareIteratorById> setEntries;
 
     const setEntries &GetMemPoolParents(txiter entry) const
         EXCLUSIVE_LOCKS_REQUIRED(cs);
@@ -572,14 +572,14 @@
         EXCLUSIVE_LOCKS_REQUIRED(cs);
 
 private:
-    typedef std::map<txiter, setEntries, CompareIteratorByHash> cacheMap;
+    typedef std::map<txiter, setEntries, CompareIteratorById> cacheMap;
 
     struct TxLinks {
         setEntries parents;
         setEntries children;
     };
 
-    typedef std::map<txiter, TxLinks, CompareIteratorByHash> txlinksMap;
+    typedef std::map<txiter, TxLinks, CompareIteratorById> txlinksMap;
     txlinksMap mapLinks;
 
     void UpdateParent(txiter entry, txiter parent, bool add);