diff --git a/src/validation.cpp b/src/validation.cpp
index 0feda3f8a5d..5c585438d14 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -511,7 +511,7 @@ public:
 
         /** Parameters for child-with-unconfirmed-parents package validation. */
         static ATMPArgs PackageChildWithParents(const CChainParams& chainparams, int64_t accept_time,
-                                                std::vector<COutPoint>& coins_to_uncache, std::optional<CFeeRate>& client_maxfeerate) {
+                                                std::vector<COutPoint>& coins_to_uncache, const std::optional<CFeeRate>& client_maxfeerate) {
             return ATMPArgs{/* m_chainparams */ chainparams,
                             /* m_accept_time */ accept_time,
                             /* m_bypass_limits */ false,
@@ -1716,7 +1716,7 @@ MempoolAcceptResult AcceptToMemoryPool(Chainstate& active_chainstate, const CTra
 }
 
 PackageMempoolAcceptResult ProcessNewPackage(Chainstate& active_chainstate, CTxMemPool& pool,
-                                                   const Package& package, bool test_accept, std::optional<CFeeRate> client_maxfeerate)
+                                                   const Package& package, bool test_accept, const std::optional<CFeeRate>& client_maxfeerate)
 {
     AssertLockHeld(cs_main);
     assert(!package.empty());
diff --git a/src/validation.h b/src/validation.h
index d0f5862032e..de810580333 100644
--- a/src/validation.h
+++ b/src/validation.h
@@ -282,7 +282,7 @@ MempoolAcceptResult AcceptToMemoryPool(Chainstate& active_chainstate, const CTra
 * possible for the package to be partially submitted.
 */
 PackageMempoolAcceptResult ProcessNewPackage(Chainstate& active_chainstate, CTxMemPool& pool,
-                                                   const Package& txns, bool test_accept, std::optional<CFeeRate> client_maxfeerate)
+                                                   const Package& txns, bool test_accept, const std::optional<CFeeRate>& client_maxfeerate)
                                                    EXCLUSIVE_LOCKS_REQUIRED(cs_main);
 
 /* Mempool validation helper functions */