diff --git a/src/policy/fees.cpp b/src/policy/fees.cpp
index b958270c3ba..c49b9fa36b9 100644
--- a/src/policy/fees.cpp
+++ b/src/policy/fees.cpp
@@ -710,6 +710,7 @@ CFeeRate CBlockPolicyEstimator::estimateRawFee(int confTarget, double successThr
 
 unsigned int CBlockPolicyEstimator::HighestTargetTracked(FeeEstimateHorizon horizon) const
 {
+    LOCK(m_cs_fee_estimator);
     switch (horizon) {
     case FeeEstimateHorizon::SHORT_HALFLIFE: {
         return shortStats->GetMaxConfirms();
diff --git a/src/policy/fees.h b/src/policy/fees.h
index e303686c739..c8472a12f5d 100644
--- a/src/policy/fees.h
+++ b/src/policy/fees.h
@@ -246,9 +246,9 @@ private:
     std::map<uint256, TxStatsInfo> mapMemPoolTxs GUARDED_BY(m_cs_fee_estimator);
 
     /** Classes to track historical data on transaction confirmations */
-    std::unique_ptr<TxConfirmStats> feeStats;
-    std::unique_ptr<TxConfirmStats> shortStats;
-    std::unique_ptr<TxConfirmStats> longStats;
+    std::unique_ptr<TxConfirmStats> feeStats PT_GUARDED_BY(m_cs_fee_estimator);
+    std::unique_ptr<TxConfirmStats> shortStats PT_GUARDED_BY(m_cs_fee_estimator);
+    std::unique_ptr<TxConfirmStats> longStats PT_GUARDED_BY(m_cs_fee_estimator);
 
     unsigned int trackedTxs GUARDED_BY(m_cs_fee_estimator);
     unsigned int untrackedTxs GUARDED_BY(m_cs_fee_estimator);