diff --git a/src/txmempool.h b/src/txmempool.h
--- a/src/txmempool.h
+++ b/src/txmempool.h
@@ -390,6 +390,8 @@
     }
 };
 
+typedef std::pair<double, Amount> TXModifier;
+
 /**
  * CTxMemPool stores valid-according-to-the-current-best-chain transactions that
  * may be included in the next block.
@@ -557,7 +559,7 @@
 
 public:
     indirectmap<COutPoint, const CTransaction *> mapNextTx;
-    std::map<uint256, std::pair<double, Amount>> mapDeltas;
+    std::map<uint256, TXModifier> m_txModifiers;
 
     /** Create a new CTxMemPool.
      */
diff --git a/src/txmempool.cpp b/src/txmempool.cpp
--- a/src/txmempool.cpp
+++ b/src/txmempool.cpp
@@ -422,10 +422,10 @@
     // Update transaction for any feeDelta created by PrioritiseTransaction
     // TODO: refactor so that the fee delta is calculated before inserting into
     // mapTx.
-    std::map<uint256, std::pair<double, Amount>>::const_iterator pos =
-        mapDeltas.find(hash);
-    if (pos != mapDeltas.end()) {
-        const std::pair<double, Amount> &deltas = pos->second;
+    std::map<uint256, TXModifier>::const_iterator pos =
+        m_txModifiers.find(hash);
+    if (pos != m_txModifiers.end()) {
+        const TXModifier &deltas = pos->second;
         if (deltas.second != Amount(0)) {
             mapTx.modify(newit, update_fee_delta(deltas.second));
         }
@@ -989,7 +989,7 @@
                                        const Amount nFeeDelta) {
     {
         LOCK(cs);
-        std::pair<double, Amount> &deltas = mapDeltas[hash];
+        TXModifier &deltas = m_txModifiers[hash];
         deltas.first += dPriorityDelta;
         deltas.second += nFeeDelta;
         txiter it = mapTx.find(hash);
@@ -1023,20 +1023,20 @@
 void CTxMemPool::ApplyDeltas(const uint256 hash, double &dPriorityDelta,
                              Amount &nFeeDelta) const {
     LOCK(cs);
-    std::map<uint256, std::pair<double, Amount>>::const_iterator pos =
-        mapDeltas.find(hash);
-    if (pos == mapDeltas.end()) {
+    std::map<uint256, TXModifier>::const_iterator pos =
+        m_txModifiers.find(hash);
+    if (pos == m_txModifiers.end()) {
         return;
     }
 
-    const std::pair<double, Amount> &deltas = pos->second;
+    const TXModifier &deltas = pos->second;
     dPriorityDelta += deltas.first;
     nFeeDelta += deltas.second;
 }
 
 void CTxMemPool::ClearPrioritisation(const uint256 hash) {
     LOCK(cs);
-    mapDeltas.erase(hash);
+    m_txModifiers.erase(hash);
 }
 
 bool CTxMemPool::HasNoInputsOf(const CTransaction &tx) const {
@@ -1082,7 +1082,7 @@
                                  15 * sizeof(void *)) *
                mapTx.size() +
            memusage::DynamicUsage(mapNextTx) +
-           memusage::DynamicUsage(mapDeltas) +
+           memusage::DynamicUsage(m_txModifiers) +
            memusage::DynamicUsage(mapLinks) +
            memusage::DynamicUsage(vTxHashes) + cachedInnerUsage;
 }
diff --git a/src/validation.cpp b/src/validation.cpp
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -5390,7 +5390,7 @@
 
     {
         LOCK(mempool.cs);
-        for (const auto &i : mempool.mapDeltas) {
+        for (const auto &i : mempool.m_txModifiers) {
             mapDeltas[i.first] = i.second.second;
         }
         vinfo = mempool.infoAll();