diff --git a/src/wallet/rpcwallet.cpp b/src/wallet/rpcwallet.cpp
index bfac99063..1514c978b 100644
--- a/src/wallet/rpcwallet.cpp
+++ b/src/wallet/rpcwallet.cpp
@@ -3332,7 +3332,7 @@ UniValue rescanblockchain(const JSONRPCRequest& request)
         }
     }
 
-    CBlockIndex *stopBlock = pwallet->ScanForWalletTransactions(pindexStart, pindexStop, reserver, true);
+    const CBlockIndex* stopBlock = pwallet->ScanForWalletTransactions(pindexStart, pindexStop, reserver, true);
     if (!stopBlock) {
         if (pwallet->IsAbortingRescan()) {
             throw JSONRPCError(RPC_MISC_ERROR, "Rescan aborted.");
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index 8ea4c5c49..0e135d978 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -1637,7 +1637,7 @@ int64_t CWallet::RescanFromTime(int64_t startTime, const WalletRescanReserver& r
  * the main chain after to the addition of any new keys you want to detect
  * transactions for.
  */
-CBlockIndex* CWallet::ScanForWalletTransactions(CBlockIndex* pindexStart, CBlockIndex* pindexStop, const WalletRescanReserver &reserver, bool fUpdate)
+const CBlockIndex* CWallet::ScanForWalletTransactions(const CBlockIndex* const pindexStart, const CBlockIndex* const pindexStop, const WalletRescanReserver& reserver, bool fUpdate)
 {
     int64_t nNow = GetTime();
     const CChainParams& chainParams = Params();
@@ -1647,8 +1647,8 @@ CBlockIndex* CWallet::ScanForWalletTransactions(CBlockIndex* pindexStart, CBlock
         assert(pindexStop->nHeight >= pindexStart->nHeight);
     }
 
-    CBlockIndex* pindex = pindexStart;
-    CBlockIndex* ret = nullptr;
+    const CBlockIndex* pindex = pindexStart;
+    const CBlockIndex* ret = nullptr;
 
     if (pindex) WalletLogPrintf("Rescan started from block %d...\n", pindex->nHeight);
 
diff --git a/src/wallet/wallet.h b/src/wallet/wallet.h
index f96798201..dcd1ee687 100644
--- a/src/wallet/wallet.h
+++ b/src/wallet/wallet.h
@@ -896,7 +896,7 @@ public:
     void BlockConnected(const std::shared_ptr<const CBlock>& pblock, const CBlockIndex *pindex, const std::vector<CTransactionRef>& vtxConflicted) override;
     void BlockDisconnected(const std::shared_ptr<const CBlock>& pblock) override;
     int64_t RescanFromTime(int64_t startTime, const WalletRescanReserver& reserver, bool update);
-    CBlockIndex* ScanForWalletTransactions(CBlockIndex* pindexStart, CBlockIndex* pindexStop, const WalletRescanReserver& reserver, bool fUpdate = false);
+    const CBlockIndex* ScanForWalletTransactions(const CBlockIndex* const pindexStart, const CBlockIndex* const pindexStop, const WalletRescanReserver& reserver, bool fUpdate = false);
     void TransactionRemovedFromMempool(const CTransactionRef &ptx) override;
     void ReacceptWalletTransactions();
     void ResendWalletTransactions(int64_t nBestBlockTime, CConnman* connman) override EXCLUSIVE_LOCKS_REQUIRED(cs_main);