diff --git a/src/script/standard.cpp b/src/script/standard.cpp
index f0b2c62a9..d7b172479 100644
--- a/src/script/standard.cpp
+++ b/src/script/standard.cpp
@@ -324,8 +324,6 @@ CScript GetScriptForMultisig(int nRequired, const std::vector<CPubKey>& keys)
 
 CScript GetScriptForWitness(const CScript& redeemscript)
 {
-    CScript ret;
-
     txnouttype typ;
     std::vector<std::vector<unsigned char> > vSolutions;
     if (Solver(redeemscript, typ, vSolutions)) {
diff --git a/src/test/miner_tests.cpp b/src/test/miner_tests.cpp
index 9a325f5f4..10c7fd00e 100644
--- a/src/test/miner_tests.cpp
+++ b/src/test/miner_tests.cpp
@@ -209,7 +209,7 @@ BOOST_AUTO_TEST_CASE(CreateNewBlock_validity)
     const CChainParams& chainparams = *chainParams;
     CScript scriptPubKey = CScript() << ParseHex("04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f") << OP_CHECKSIG;
     std::unique_ptr<CBlockTemplate> pblocktemplate;
-    CMutableTransaction tx,tx2;
+    CMutableTransaction tx;
     CScript script;
     uint256 hash;
     TestMemPoolEntryHelper entry;
diff --git a/src/test/transaction_tests.cpp b/src/test/transaction_tests.cpp
index 45dc0e357..aff270942 100644
--- a/src/test/transaction_tests.cpp
+++ b/src/test/transaction_tests.cpp
@@ -547,7 +547,6 @@ BOOST_AUTO_TEST_CASE(test_witness)
 
     CTransactionRef output1, output2;
     CMutableTransaction input1, input2;
-    SignatureData sigdata;
 
     // Normal pay-to-compressed-pubkey.
     CreateCreditAndSpend(keystore, scriptPubkey1, output1, input1);
diff --git a/src/txmempool.cpp b/src/txmempool.cpp
index 8090172e3..1db006ecd 100644
--- a/src/txmempool.cpp
+++ b/src/txmempool.cpp
@@ -716,7 +716,6 @@ void CTxMemPool::check(const CCoinsViewCache *pcoins) const
     while (!waitingOnDependants.empty()) {
         const CTxMemPoolEntry* entry = waitingOnDependants.front();
         waitingOnDependants.pop_front();
-        CValidationState state;
         if (!mempoolDuplicate.HaveInputs(entry->GetTx())) {
             waitingOnDependants.push_back(entry);
             stepsSinceLastRemove++;