diff --git a/src/txmempool.h b/src/txmempool.h
--- a/src/txmempool.h
+++ b/src/txmempool.h
@@ -497,7 +497,7 @@
     //! Value n means that 1 times in n we check.
     const int m_check_ratio;
     //! Used by getblocktemplate to trigger CreateNewBlock() invocation
-    std::atomic<uint32_t> nTransactionsUpdated;
+    std::atomic<uint32_t> nTransactionsUpdated{0};
 
     //! sum of all mempool tx's sizes.
     uint64_t totalTxSize;
@@ -509,8 +509,8 @@
     mutable bool blockSinceLastRollingFeeBump;
     //! minimum fee to get into the pool, decreases exponentially
     mutable double rollingMinimumFeeRate;
-    mutable uint64_t m_epoch;
-    mutable bool m_has_epoch_guard;
+    mutable uint64_t m_epoch{0};
+    mutable bool m_has_epoch_guard{false};
 
     // In-memory counter for external mempool tracking purposes.
     // This number is incremented once every time a transaction
diff --git a/src/txmempool.cpp b/src/txmempool.cpp
--- a/src/txmempool.cpp
+++ b/src/txmempool.cpp
@@ -399,9 +399,7 @@
     assert(int(nSigOpCountWithAncestors) >= 0);
 }
 
-CTxMemPool::CTxMemPool(int check_ratio)
-    : m_check_ratio(check_ratio), nTransactionsUpdated(0), m_epoch(0),
-      m_has_epoch_guard(false) {
+CTxMemPool::CTxMemPool(int check_ratio) : m_check_ratio(check_ratio) {
     // lock free clear
     _clear();
 }