diff --git a/src/coins.cpp b/src/coins.cpp
index a8e270fc5..f291cea2d 100644
--- a/src/coins.cpp
+++ b/src/coins.cpp
@@ -52,7 +52,7 @@ bool CCoinsView::BatchWrite(CCoinsMap &mapCoins,
                             const uint256 &hashBlock,
                             const uint256 &hashAnchor,
                             CAnchorsMap &mapAnchors,
-                            CNullifiersMap &mapNullifiers,
+                            CNullifiersMap &mapSproutNullifiers,
                             CNullifiersMap &mapSaplingNullifiers) { return false; }
 bool CCoinsView::GetStats(CCoinsStats &stats) const { return false; }
 
@@ -70,8 +70,8 @@ bool CCoinsViewBacked::BatchWrite(CCoinsMap &mapCoins,
                                   const uint256 &hashBlock,
                                   const uint256 &hashAnchor,
                                   CAnchorsMap &mapAnchors,
-                                  CNullifiersMap &mapNullifiers,
-                                  CNullifiersMap &mapSaplingNullifiers) { return base->BatchWrite(mapCoins, hashBlock, hashAnchor, mapAnchors, mapNullifiers, mapSaplingNullifiers); }
+                                  CNullifiersMap &mapSproutNullifiers,
+                                  CNullifiersMap &mapSaplingNullifiers) { return base->BatchWrite(mapCoins, hashBlock, hashAnchor, mapAnchors, mapSproutNullifiers, mapSaplingNullifiers); }
 bool CCoinsViewBacked::GetStats(CCoinsStats &stats) const { return base->GetStats(stats); }
 
 CCoinsKeyHasher::CCoinsKeyHasher() : salt(GetRandHash()) {}
@@ -86,7 +86,7 @@ CCoinsViewCache::~CCoinsViewCache()
 size_t CCoinsViewCache::DynamicMemoryUsage() const {
     return memusage::DynamicUsage(cacheCoins) +
            memusage::DynamicUsage(cacheAnchors) +
-           memusage::DynamicUsage(cacheNullifiers) +
+           memusage::DynamicUsage(cacheSproutNullifiers) +
            memusage::DynamicUsage(cacheSaplingNullifiers) +
            cachedCoinsUsage;
 }
@@ -137,7 +137,7 @@ bool CCoinsViewCache::GetNullifier(const uint256 &nullifier, NullifierType type)
     CNullifiersMap* cacheToUse;
     switch (type) {
         case SPROUT_NULLIFIER:
-            cacheToUse = &cacheNullifiers;
+            cacheToUse = &cacheSproutNullifiers;
             break;
         case SAPLING_NULLIFIER:
             cacheToUse = &cacheSaplingNullifiers;
@@ -213,7 +213,7 @@ void CCoinsViewCache::PopAnchor(const uint256 &newrt) {
 void CCoinsViewCache::SetNullifiers(const CTransaction& tx, bool spent) {
     for (const JSDescription &joinsplit : tx.vjoinsplit) {
         for (const uint256 &nullifier : joinsplit.nullifiers) {
-            std::pair<CNullifiersMap::iterator, bool> ret = cacheNullifiers.insert(std::make_pair(nullifier, CNullifiersCacheEntry()));
+            std::pair<CNullifiersMap::iterator, bool> ret = cacheSproutNullifiers.insert(std::make_pair(nullifier, CNullifiersCacheEntry()));
             ret.first->second.entered = spent;
             ret.first->second.flags |= CNullifiersCacheEntry::DIRTY;
         }
@@ -316,7 +316,7 @@ bool CCoinsViewCache::BatchWrite(CCoinsMap &mapCoins,
                                  const uint256 &hashBlockIn,
                                  const uint256 &hashAnchorIn,
                                  CAnchorsMap &mapAnchors,
-                                 CNullifiersMap &mapNullifiers,
+                                 CNullifiersMap &mapSproutNullifiers,
                                  CNullifiersMap &mapSaplingNullifiers) {
     assert(!hasModifier);
     for (CCoinsMap::iterator it = mapCoins.begin(); it != mapCoins.end();) {
@@ -379,7 +379,7 @@ bool CCoinsViewCache::BatchWrite(CCoinsMap &mapCoins,
         mapAnchors.erase(itOld);
     }
 
-    ::BatchWriteNullifiers(mapNullifiers, cacheNullifiers);
+    ::BatchWriteNullifiers(mapSproutNullifiers, cacheSproutNullifiers);
     ::BatchWriteNullifiers(mapSaplingNullifiers, cacheSaplingNullifiers);
 
     hashAnchor = hashAnchorIn;
@@ -388,10 +388,10 @@ bool CCoinsViewCache::BatchWrite(CCoinsMap &mapCoins,
 }
 
 bool CCoinsViewCache::Flush() {
-    bool fOk = base->BatchWrite(cacheCoins, hashBlock, hashAnchor, cacheAnchors, cacheNullifiers, cacheSaplingNullifiers);
+    bool fOk = base->BatchWrite(cacheCoins, hashBlock, hashAnchor, cacheAnchors, cacheSproutNullifiers, cacheSaplingNullifiers);
     cacheCoins.clear();
     cacheAnchors.clear();
-    cacheNullifiers.clear();
+    cacheSproutNullifiers.clear();
     cacheSaplingNullifiers.clear();
     cachedCoinsUsage = 0;
     return fOk;
diff --git a/src/coins.h b/src/coins.h
index 7fffa8dab..e2b454649 100644
--- a/src/coins.h
+++ b/src/coins.h
@@ -351,7 +351,7 @@ public:
                             const uint256 &hashBlock,
                             const uint256 &hashAnchor,
                             CAnchorsMap &mapAnchors,
-                            CNullifiersMap &mapNullifiers,
+                            CNullifiersMap &mapSproutNullifiers,
                             CNullifiersMap &mapSaplingNullifiers);
 
     //! Calculate statistics about the unspent transaction output set
@@ -381,7 +381,7 @@ public:
                     const uint256 &hashBlock,
                     const uint256 &hashAnchor,
                     CAnchorsMap &mapAnchors,
-                    CNullifiersMap &mapNullifiers,
+                    CNullifiersMap &mapSproutNullifiers,
                     CNullifiersMap &mapSaplingNullifiers);
     bool GetStats(CCoinsStats &stats) const;
 };
@@ -425,7 +425,7 @@ protected:
     mutable CCoinsMap cacheCoins;
     mutable uint256 hashAnchor;
     mutable CAnchorsMap cacheAnchors;
-    mutable CNullifiersMap cacheNullifiers;
+    mutable CNullifiersMap cacheSproutNullifiers;
     mutable CNullifiersMap cacheSaplingNullifiers;
 
     /* Cached dynamic memory usage for the inner CCoins objects. */
@@ -447,7 +447,7 @@ public:
                     const uint256 &hashBlock,
                     const uint256 &hashAnchor,
                     CAnchorsMap &mapAnchors,
-                    CNullifiersMap &mapNullifiers,
+                    CNullifiersMap &mapSproutNullifiers,
                     CNullifiersMap &mapSaplingNullifiers);
 
 
@@ -459,7 +459,7 @@ public:
     // the new current root.
     void PopAnchor(const uint256 &rt);
 
-    // Marks a nullifiers for a given transaction as spent or not.
+    // Marks nullifiers for a given transaction as spent or not.
     void SetNullifiers(const CTransaction& tx, bool spent);
 
     /**
diff --git a/src/gtest/test_mempool.cpp b/src/gtest/test_mempool.cpp
index 4203cf6f1..981c4eb08 100644
--- a/src/gtest/test_mempool.cpp
+++ b/src/gtest/test_mempool.cpp
@@ -56,7 +56,7 @@ public:
                     const uint256 &hashBlock,
                     const uint256 &hashAnchor,
                     CAnchorsMap &mapAnchors,
-                    CNullifiersMap &mapNullifiers,
+                    CNullifiersMap &mapSproutNullifiers,
                     CNullifiersMap &mapSaplingNullifiers) {
         return false;
     }
diff --git a/src/gtest/test_validation.cpp b/src/gtest/test_validation.cpp
index d321e11e0..710e3c600 100644
--- a/src/gtest/test_validation.cpp
+++ b/src/gtest/test_validation.cpp
@@ -51,7 +51,7 @@ public:
                     const uint256 &hashBlock,
                     const uint256 &hashAnchor,
                     CAnchorsMap &mapAnchors,
-                    CNullifiersMap &mapNullifiers,
+                    CNullifiersMap &mapSproutNullifiers,
                     CNullifiersMap saplingNullifiersMap) {
         return false;
     }
diff --git a/src/main.cpp b/src/main.cpp
index 9d7e38099..784d5e09b 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1270,13 +1270,15 @@ bool AcceptToMemoryPool(CTxMemPool& pool, CValidationState &state, const CTransa
     }
     BOOST_FOREACH(const JSDescription &joinsplit, tx.vjoinsplit) {
         BOOST_FOREACH(const uint256 &nf, joinsplit.nullifiers) {
-            if (pool.nullifierExists(nf, SPROUT_NULLIFIER))
+            if (pool.nullifierExists(nf, SPROUT_NULLIFIER)) {
                 return false;
+            }
         }
     }
     for (const SpendDescription &spendDescription : tx.vShieldedSpend) {
-        if (pool.nullifierExists(spendDescription.nullifier, SAPLING_NULLIFIER))
+        if (pool.nullifierExists(spendDescription.nullifier, SAPLING_NULLIFIER)) {
             return false;
+        }
     }
     }
 
diff --git a/src/test/coins_tests.cpp b/src/test/coins_tests.cpp
index 2d29338ce..8225fce5d 100644
--- a/src/test/coins_tests.cpp
+++ b/src/test/coins_tests.cpp
@@ -28,7 +28,7 @@ class CCoinsViewTest : public CCoinsView
     uint256 hashBestAnchor_;
     std::map<uint256, CCoins> map_;
     std::map<uint256, ZCIncrementalMerkleTree> mapAnchors_;
-    std::map<uint256, bool> mapNullifiers_;
+    std::map<uint256, bool> mapSproutNullifiers_;
     std::map<uint256, bool> mapSaplingNullifiers_;
 
 public:
@@ -57,7 +57,7 @@ public:
         const std::map<uint256, bool>* mapToUse;
         switch (type) {
             case SPROUT_NULLIFIER:
-                mapToUse = &mapNullifiers_;
+                mapToUse = &mapSproutNullifiers_;
                 break;
             case SAPLING_NULLIFIER:
                 mapToUse = &mapSaplingNullifiers_;
@@ -116,7 +116,7 @@ public:
                     const uint256& hashBlock,
                     const uint256& hashAnchor,
                     CAnchorsMap& mapAnchors,
-                    CNullifiersMap& mapNullifiers,
+                    CNullifiersMap& mapSproutNullifiers,
                     CNullifiersMap& mapSaplingNullifiers)
     {
         for (CCoinsMap::iterator it = mapCoins.begin(); it != mapCoins.end(); ) {
@@ -139,7 +139,7 @@ public:
             mapAnchors.erase(it++);
         }
 
-        BatchWriteNullifiers(mapNullifiers, mapNullifiers_);
+        BatchWriteNullifiers(mapSproutNullifiers, mapSproutNullifiers_);
         BatchWriteNullifiers(mapSaplingNullifiers, mapSaplingNullifiers_);
 
         mapCoins.clear();
@@ -162,7 +162,7 @@ public:
         // Manually recompute the dynamic usage of the whole data, and compare it.
         size_t ret = memusage::DynamicUsage(cacheCoins) +
                      memusage::DynamicUsage(cacheAnchors) +
-                     memusage::DynamicUsage(cacheNullifiers) +
+                     memusage::DynamicUsage(cacheSproutNullifiers) +
                      memusage::DynamicUsage(cacheSaplingNullifiers);
         for (CCoinsMap::iterator it = cacheCoins.begin(); it != cacheCoins.end(); it++) {
             ret += it->second.coins.DynamicMemoryUsage();
diff --git a/src/txdb.cpp b/src/txdb.cpp
index 715f295f7..4759ff106 100644
--- a/src/txdb.cpp
+++ b/src/txdb.cpp
@@ -109,7 +109,7 @@ bool CCoinsViewDB::BatchWrite(CCoinsMap &mapCoins,
                               const uint256 &hashBlock,
                               const uint256 &hashAnchor,
                               CAnchorsMap &mapAnchors,
-                              CNullifiersMap &mapNullifiers,
+                              CNullifiersMap &mapSproutNullifiers,
                               CNullifiersMap &mapSaplingNullifiers) {
     CDBBatch batch(db);
     size_t count = 0;
@@ -140,7 +140,7 @@ bool CCoinsViewDB::BatchWrite(CCoinsMap &mapCoins,
         mapAnchors.erase(itOld);
     }
 
-    ::BatchWriteNullifiers(batch, mapNullifiers, DB_NULLIFIER);
+    ::BatchWriteNullifiers(batch, mapSproutNullifiers, DB_NULLIFIER);
     ::BatchWriteNullifiers(batch, mapSaplingNullifiers, DB_SAPLING_NULLIFIER);
 
     if (!hashBlock.IsNull())
diff --git a/src/txdb.h b/src/txdb.h
index 01bc576fc..53f3c31c6 100644
--- a/src/txdb.h
+++ b/src/txdb.h
@@ -45,7 +45,7 @@ public:
                     const uint256 &hashBlock,
                     const uint256 &hashAnchor,
                     CAnchorsMap &mapAnchors,
-                    CNullifiersMap &mapNullifiers,
+                    CNullifiersMap &mapSproutNullifiers,
                     CNullifiersMap &mapSaplingNullifiers);
     bool GetStats(CCoinsStats &stats) const;
 };
diff --git a/src/txmempool.cpp b/src/txmempool.cpp
index 626bd9df6..9480d81cd 100644
--- a/src/txmempool.cpp
+++ b/src/txmempool.cpp
@@ -107,7 +107,7 @@ bool CTxMemPool::addUnchecked(const uint256& hash, const CTxMemPoolEntry &entry,
         mapNextTx[tx.vin[i].prevout] = CInPoint(&tx, i);
     BOOST_FOREACH(const JSDescription &joinsplit, tx.vjoinsplit) {
         BOOST_FOREACH(const uint256 &nf, joinsplit.nullifiers) {
-            mapNullifiers[nf] = &tx;
+            mapSproutNullifiers[nf] = &tx;
         }
     }
     for (const SpendDescription &spendDescription : tx.vShieldedSpend) {
@@ -121,6 +121,7 @@ bool CTxMemPool::addUnchecked(const uint256& hash, const CTxMemPoolEntry &entry,
     return true;
 }
 
+
 void CTxMemPool::remove(const CTransaction &origTx, std::list<CTransaction>& removed, bool fRecursive)
 {
     // Remove transaction from memory pool
@@ -159,7 +160,7 @@ void CTxMemPool::remove(const CTransaction &origTx, std::list<CTransaction>& rem
                 mapNextTx.erase(txin.prevout);
             BOOST_FOREACH(const JSDescription& joinsplit, tx.vjoinsplit) {
                 BOOST_FOREACH(const uint256& nf, joinsplit.nullifiers) {
-                    mapNullifiers.erase(nf);
+                    mapSproutNullifiers.erase(nf);
                 }
             }
             for (const SpendDescription &spendDescription : tx.vShieldedSpend) {
@@ -248,11 +249,12 @@ void CTxMemPool::removeConflicts(const CTransaction &tx, std::list<CTransaction>
 
     BOOST_FOREACH(const JSDescription &joinsplit, tx.vjoinsplit) {
         BOOST_FOREACH(const uint256 &nf, joinsplit.nullifiers) {
-            std::map<uint256, const CTransaction*>::iterator it = mapNullifiers.find(nf);
-            if (it != mapNullifiers.end()) {
+            std::map<uint256, const CTransaction*>::iterator it = mapSproutNullifiers.find(nf);
+            if (it != mapSproutNullifiers.end()) {
                 const CTransaction &txConflict = *it->second;
-                if (txConflict != tx)
+                if (txConflict != tx) {
                     remove(txConflict, removed, true);
+                }
             }
         }
     }
@@ -260,8 +262,9 @@ void CTxMemPool::removeConflicts(const CTransaction &tx, std::list<CTransaction>
         std::map<uint256, const CTransaction*>::iterator it = mapSaplingNullifiers.find(spendDescription.nullifier);
         if (it != mapSaplingNullifiers.end()) {
             const CTransaction &txConflict = *it->second;
-            if (txConflict != tx)
+            if (txConflict != tx) {
                 remove(txConflict, removed, true);
+            }
         }
     }
 }
@@ -461,7 +464,7 @@ void CTxMemPool::checkNullifiers(NullifierType type) const
     const std::map<uint256, const CTransaction*>* mapToUse;
     switch (type) {
         case SPROUT_NULLIFIER:
-            mapToUse = &mapNullifiers;
+            mapToUse = &mapSproutNullifiers;
             break;
         case SAPLING_NULLIFIER:
             mapToUse = &mapSaplingNullifiers;
@@ -583,7 +586,7 @@ bool CTxMemPool::nullifierExists(const uint256& nullifier, NullifierType type) c
 {
     switch (type) {
         case SPROUT_NULLIFIER:
-            return mapNullifiers.count(nullifier);
+            return mapSproutNullifiers.count(nullifier);
         case SAPLING_NULLIFIER:
             return mapSaplingNullifiers.count(nullifier);
         default:
diff --git a/src/txmempool.h b/src/txmempool.h
index 1b5b3e6b0..0397c6d7f 100644
--- a/src/txmempool.h
+++ b/src/txmempool.h
@@ -131,7 +131,7 @@ private:
     uint64_t totalTxSize = 0; //! sum of all mempool tx' byte sizes
     uint64_t cachedInnerUsage; //! sum of dynamic memory usage of all the map elements (NOT the maps themselves)
 
-    std::map<uint256, const CTransaction*> mapNullifiers;
+    std::map<uint256, const CTransaction*> mapSproutNullifiers;
     std::map<uint256, const CTransaction*> mapSaplingNullifiers;
 
     void checkNullifiers(NullifierType type) const;
@@ -154,7 +154,7 @@ public:
     indexed_transaction_set mapTx;
     std::map<COutPoint, CInPoint> mapNextTx;
     std::map<uint256, std::pair<double, CAmount> > mapDeltas;
-    
+
     CTxMemPool(const CFeeRate& _minRelayFee);
     ~CTxMemPool();
 
diff --git a/src/zcbenchmarks.cpp b/src/zcbenchmarks.cpp
index 236a22686..1d4ad78c8 100644
--- a/src/zcbenchmarks.cpp
+++ b/src/zcbenchmarks.cpp
@@ -382,7 +382,7 @@ public:
                     const uint256 &hashBlock,
                     const uint256 &hashAnchor,
                     CAnchorsMap &mapAnchors,
-                    CNullifiersMap &mapNullifiers,
+                    CNullifiersMap &mapSproutNullifiers,
                     CNullifiersMap& mapSaplingNullifiers) {
         return false;
     }