diff --git a/src/txmempool.h b/src/txmempool.h
--- a/src/txmempool.h
+++ b/src/txmempool.h
@@ -66,21 +66,21 @@
 
 class CTxMemPoolEntry {
 private:
-    CTransactionRef tx;
+    const CTransactionRef tx;
     //!< Cached to avoid expensive parent-transaction lookups
-    Amount nFee;
+    const Amount nFee;
     //!< ... and avoid recomputing tx size
-    size_t nTxSize;
+    const size_t nTxSize;
     //!< ... and total memory usage
-    size_t nUsageSize;
+    const size_t nUsageSize;
     //!< Local time when entering the mempool
-    int64_t nTime;
+    const int64_t nTime;
     //!< Chain height when entering the mempool
-    unsigned int entryHeight;
+    const unsigned int entryHeight;
     //!< keep track of transactions that spend a coinbase
-    bool spendsCoinbase;
+    const bool spendsCoinbase;
     //!< Total sigop plus P2SH sigops count
-    int64_t sigOpCount;
+    const int64_t sigOpCount;
     //!< Used for determining the priority of the transaction for mining in a
     //! block
     Amount feeDelta;
diff --git a/src/txmempool.cpp b/src/txmempool.cpp
--- a/src/txmempool.cpp
+++ b/src/txmempool.cpp
@@ -29,12 +29,10 @@
                                  int64_t _nTime, unsigned int _entryHeight,
                                  bool _spendsCoinbase, int64_t _sigOpsCount,
                                  LockPoints lp)
-    : tx(_tx), nFee(_nFee), nTime(_nTime), entryHeight(_entryHeight),
-      spendsCoinbase(_spendsCoinbase), sigOpCount(_sigOpsCount),
-      lockPoints(lp) {
-    nTxSize = tx->GetTotalSize();
-    nUsageSize = RecursiveDynamicUsage(tx);
-
+    : tx(_tx), nFee(_nFee), nTxSize(tx->GetTotalSize()),
+      nUsageSize(RecursiveDynamicUsage(tx)), nTime(_nTime),
+      entryHeight(_entryHeight), spendsCoinbase(_spendsCoinbase),
+      sigOpCount(_sigOpsCount), lockPoints(lp) {
     nCountWithDescendants = 1;
     nSizeWithDescendants = GetTxSize();
     nModFeesWithDescendants = nFee;