diff --git a/src/chainparams.h b/src/chainparams.h
index c60baf6e3..853a43e22 100644
--- a/src/chainparams.h
+++ b/src/chainparams.h
@@ -92,23 +92,23 @@ protected:
     CMessageHeader::MessageStartChars pchMessageStart;
     //! Raw pub key bytes for the broadcast alert signing key.
     std::vector<unsigned char> vAlertPubKey;
-    int nDefaultPort;
-    int nMinerThreads;
-    long nMaxTipAge;
-    uint64_t nPruneAfterHeight;
-    unsigned int nEquihashN;
-    unsigned int nEquihashK;
+    int nDefaultPort = 0;
+    int nMinerThreads = 0;
+    long nMaxTipAge = 0;
+    uint64_t nPruneAfterHeight = 0;
+    unsigned int nEquihashN = 0;
+    unsigned int nEquihashK = 0;
     std::vector<CDNSSeedData> vSeeds;
     std::vector<unsigned char> base58Prefixes[MAX_BASE58_TYPES];
     std::string strNetworkID;
     CBlock genesis;
     std::vector<SeedSpec6> vFixedSeeds;
-    bool fRequireRPCPassword;
-    bool fMiningRequiresPeers;
-    bool fDefaultConsistencyChecks;
-    bool fRequireStandard;
-    bool fMineBlocksOnDemand;
-    bool fTestnetToBeDeprecatedFieldRPC;
+    bool fRequireRPCPassword = false;
+    bool fMiningRequiresPeers = false;
+    bool fDefaultConsistencyChecks = false;
+    bool fRequireStandard = false;
+    bool fMineBlocksOnDemand = false;
+    bool fTestnetToBeDeprecatedFieldRPC = false;
     Checkpoints::CCheckpointData checkpointData;
     std::vector<std::string> vFoundersRewardAddress;
 };
diff --git a/src/chainparamsbase.h b/src/chainparamsbase.h
index 4369d0aef..33765f0fc 100644
--- a/src/chainparamsbase.h
+++ b/src/chainparamsbase.h
@@ -29,7 +29,7 @@ public:
 protected:
     CBaseChainParams() {}
 
-    int nRPCPort;
+    int nRPCPort = 0;
     std::string strDataDir;
 };
 
diff --git a/src/policy/fees.h b/src/policy/fees.h
index 15577d128..d37d4b184 100644
--- a/src/policy/fees.h
+++ b/src/policy/fees.h
@@ -66,6 +66,9 @@ class CTxMemPoolEntry;
  * they've been outstanding.
  */
 
+/** Decay of .998 is a half-life of 346 blocks or about 2.4 days */
+static const double DEFAULT_DECAY = .998;
+
 /**
  * We will instantiate two instances of this class, one to track transactions
  * that were included in a block due to fee, and one for tx's included due to
@@ -105,7 +108,7 @@ private:
     // Combine the total value with the tx counts to calculate the avg fee/priority per bucket
 
     std::string dataTypeString;
-    double decay;
+    double decay = DEFAULT_DECAY;
 
     // Mempool counts of outstanding transactions
     // For each bucket X, track the number of transactions in the mempool
@@ -179,9 +182,6 @@ public:
 /** Track confirm delays up to 25 blocks, can't estimate beyond that */
 static const unsigned int MAX_BLOCK_CONFIRMS = 25;
 
-/** Decay of .998 is a half-life of 346 blocks or about 2.4 days */
-static const double DEFAULT_DECAY = .998;
-
 /** Require greater than 85% of X fee transactions to be confirmed within Y blocks for X to be big enough */
 static const double MIN_SUCCESS_PCT = .85;
 static const double UNLIKELY_PCT = .5;
diff --git a/src/primitives/transaction.h b/src/primitives/transaction.h
index f57ea240d..8ded62c7d 100644
--- a/src/primitives/transaction.h
+++ b/src/primitives/transaction.h
@@ -53,7 +53,7 @@ public:
     // These contain trapdoors, values and other information
     // that the recipient needs, including a memo field. It
     // is encrypted using the scheme implemented in crypto/NoteEncryption.cpp
-    boost::array<ZCNoteEncryption::Ciphertext, ZC_NUM_JS_OUTPUTS> ciphertexts;
+    boost::array<ZCNoteEncryption::Ciphertext, ZC_NUM_JS_OUTPUTS> ciphertexts = {{ {{0}} }};
 
     // Random seed
     uint256 randomSeed;
@@ -324,7 +324,7 @@ public:
     const uint32_t nLockTime;
     const std::vector<JSDescription> vjoinsplit;
     const uint256 joinSplitPubKey;
-    const joinsplit_sig_t joinSplitSig;
+    const joinsplit_sig_t joinSplitSig = {{0}};
 
     /** Construct a CTransaction that qualifies as IsNull() */
     CTransaction();
@@ -403,7 +403,7 @@ struct CMutableTransaction
     uint32_t nLockTime;
     std::vector<JSDescription> vjoinsplit;
     uint256 joinSplitPubKey;
-    CTransaction::joinsplit_sig_t joinSplitSig;
+    CTransaction::joinsplit_sig_t joinSplitSig = {{0}};
 
     CMutableTransaction();
     CMutableTransaction(const CTransaction& tx);
diff --git a/src/txmempool.h b/src/txmempool.h
index a6901fde6..e6fd8e60b 100644
--- a/src/txmempool.h
+++ b/src/txmempool.h
@@ -92,7 +92,7 @@ private:
     unsigned int nTransactionsUpdated;
     CBlockPolicyEstimator* minerPolicyEstimator;
 
-    uint64_t totalTxSize; //! sum of all mempool tx' byte sizes
+    uint64_t totalTxSize = 0; //! sum of all mempool tx' byte sizes
 
 public:
     mutable CCriticalSection cs;
diff --git a/src/zcash/IncrementalMerkleTree.hpp b/src/zcash/IncrementalMerkleTree.hpp
index 1d023168a..cd21bf651 100644
--- a/src/zcash/IncrementalMerkleTree.hpp
+++ b/src/zcash/IncrementalMerkleTree.hpp
@@ -163,7 +163,7 @@ private:
     IncrementalMerkleTree<Depth, Hash> tree;
     std::vector<Hash> filled;
     boost::optional<IncrementalMerkleTree<Depth, Hash>> cursor;
-    size_t cursor_depth;
+    size_t cursor_depth = 0;
     std::deque<Hash> partial_path() const;
     IncrementalWitness(IncrementalMerkleTree<Depth, Hash> tree) : tree(tree) {}
 };
diff --git a/src/zcash/Note.hpp b/src/zcash/Note.hpp
index 8cf53e5b4..460e68f9d 100644
--- a/src/zcash/Note.hpp
+++ b/src/zcash/Note.hpp
@@ -26,7 +26,7 @@ public:
 
 class NotePlaintext {
 public:
-    uint64_t value;
+    uint64_t value = 0;
     uint256 rho;
     uint256 r;
     boost::array<unsigned char, ZC_MEMO_SIZE> memo;