diff --git a/src/bitcoin-tx.cpp b/src/bitcoin-tx.cpp
--- a/src/bitcoin-tx.cpp
+++ b/src/bitcoin-tx.cpp
@@ -556,7 +556,8 @@
     // mergedTx will end up with all the signatures; it
     // starts as a clone of the raw tx:
     CMutableTransaction mergedTx{tx};
-    const CTransaction txv{tx};
+    const CMutableTransaction txv{tx};
+
     CCoinsView viewDummy;
     CCoinsViewCache view(&viewDummy);
 
diff --git a/src/primitives/transaction.h b/src/primitives/transaction.h
--- a/src/primitives/transaction.h
+++ b/src/primitives/transaction.h
@@ -304,7 +304,7 @@
     uint32_t nLockTime;
 
     CMutableTransaction();
-    CMutableTransaction(const CTransaction &tx);
+    explicit CMutableTransaction(const CTransaction &tx);
 
     template <typename Stream> inline void Serialize(Stream &s) const {
         SerializeTransaction(*this, s);
diff --git a/src/test/coins_tests.cpp b/src/test/coins_tests.cpp
--- a/src/test/coins_tests.cpp
+++ b/src/test/coins_tests.cpp
@@ -318,8 +318,8 @@
                 if (InsecureRandRange(10) == 0 && coinbase_coins.size()) {
                     auto utxod = FindRandomFrom(coinbase_coins);
                     // Reuse the exact same coinbase
-                    tx = std::get<0>(utxod->second);
-                    // shouldn't be available for reconnection if its been
+                    tx = CMutableTransaction{std::get<0>(utxod->second)};
+                    // shouldn't be available for reconnection if it's been
                     // duplicated
                     disconnected_coins.erase(utxod->first);
 
@@ -337,7 +337,7 @@
                 // 1/20 times reconnect a previously disconnected tx
                 if (randiter % 20 == 2 && disconnected_coins.size()) {
                     auto utxod = FindRandomFrom(disconnected_coins);
-                    tx = std::get<0>(utxod->second);
+                    tx = CMutableTransaction{std::get<0>(utxod->second)};
                     prevout = tx.vin[0].prevout;
                     if (!CTransaction(tx).IsCoinBase() &&
                         !utxoset.count(prevout)) {
diff --git a/src/test/script_tests.cpp b/src/test/script_tests.cpp
--- a/src/test/script_tests.cpp
+++ b/src/test/script_tests.cpp
@@ -135,7 +135,7 @@
 
 static CMutableTransaction
 BuildSpendingTransaction(const CScript &scriptSig,
-                         const CMutableTransaction &txCredit) {
+                         const CTransaction &txCredit) {
     CMutableTransaction txSpend;
     txSpend.nVersion = 1;
     txSpend.nLockTime = 0;
@@ -159,8 +159,8 @@
     }
 
     ScriptError err;
-    CMutableTransaction txCredit =
-        BuildCreditingTransaction(scriptPubKey, nValue);
+    const CTransaction txCredit{
+        BuildCreditingTransaction(scriptPubKey, nValue)};
     CMutableTransaction tx = BuildSpendingTransaction(scriptSig, txCredit);
     CMutableTransaction tx2 = tx;
     BOOST_CHECK_MESSAGE(VerifyScript(scriptSig, scriptPubKey, flags,
@@ -2593,8 +2593,8 @@
                    << ToByteVector(key2.GetPubKey()) << OP_2
                    << OP_CHECKMULTISIG;
 
-    CMutableTransaction txFrom12 =
-        BuildCreditingTransaction(scriptPubKey12, Amount::zero());
+    const CTransaction txFrom12{
+        BuildCreditingTransaction(scriptPubKey12, Amount::zero())};
     CMutableTransaction txTo12 = BuildSpendingTransaction(CScript(), txFrom12);
 
     CScript goodsig1 =
@@ -2641,8 +2641,8 @@
                    << ToByteVector(key3.GetPubKey()) << OP_3
                    << OP_CHECKMULTISIG;
 
-    CMutableTransaction txFrom23 =
-        BuildCreditingTransaction(scriptPubKey23, Amount::zero());
+    const CTransaction txFrom23{
+        BuildCreditingTransaction(scriptPubKey23, Amount::zero())};
     CMutableTransaction mutableTxTo23 =
         BuildSpendingTransaction(CScript(), txFrom23);
 
@@ -2757,7 +2757,8 @@
 
     CMutableTransaction txFrom = BuildCreditingTransaction(
         GetScriptForDestination(keys[0].GetPubKey().GetID()), Amount::zero());
-    CMutableTransaction txTo = BuildSpendingTransaction(CScript(), txFrom);
+    CMutableTransaction txTo =
+        BuildSpendingTransaction(CScript(), CTransaction(txFrom));
     CScript &scriptPubKey = txFrom.vout[0].scriptPubKey;
     CScript &scriptSig = txTo.vin[0].scriptSig;
 
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -2170,8 +2170,8 @@
 }
 
 bool CWalletTx::IsEquivalentTo(const CWalletTx &_tx) const {
-    CMutableTransaction tx1 = *this->tx;
-    CMutableTransaction tx2 = *_tx.tx;
+    CMutableTransaction tx1{*this->tx};
+    CMutableTransaction tx2{*_tx.tx};
     for (CTxIn &in : tx1.vin) {
         in.scriptSig = CScript();
     }