diff --git a/src/feerate.h b/src/feerate.h
--- a/src/feerate.h
+++ b/src/feerate.h
@@ -36,8 +36,6 @@
      * exceed (2^63 - 1)
      */
     CFeeRate(const Amount nFeePaid, size_t nBytes);
-    constexpr CFeeRate(const CFeeRate &other)
-        : nSatoshisPerK(other.nSatoshisPerK) {}
 
     /**
      * Return the fee in satoshis for the given size in bytes.
diff --git a/src/txmempool.h b/src/txmempool.h
--- a/src/txmempool.h
+++ b/src/txmempool.h
@@ -137,8 +137,6 @@
                     unsigned int _entryHeight, Amount _inChainInputValue,
                     bool spendsCoinbase, int64_t nSigOpsCost, LockPoints lp);
 
-    CTxMemPoolEntry(const CTxMemPoolEntry &other);
-
     const CTransaction &GetTx() const { return *this->tx; }
     CTransactionRef GetSharedTx() const { return this->tx; }
     /**
diff --git a/src/txmempool.cpp b/src/txmempool.cpp
--- a/src/txmempool.cpp
+++ b/src/txmempool.cpp
@@ -52,10 +52,6 @@
     nSigOpCountWithAncestors = sigOpCount;
 }
 
-CTxMemPoolEntry::CTxMemPoolEntry(const CTxMemPoolEntry &other) {
-    *this = other;
-}
-
 double CTxMemPoolEntry::GetPriority(unsigned int currentHeight) const {
     double deltaPriority =
         double((currentHeight - entryHeight) * (inChainInputValue / SATOSHI)) /