diff --git a/src/interfaces/chain.h b/src/interfaces/chain.h
--- a/src/interfaces/chain.h
+++ b/src/interfaces/chain.h
@@ -108,9 +108,6 @@
     public:
         virtual ~Lock() {}
 
-        //! Get block hash. Height must be valid or this function will abort.
-        virtual BlockHash getBlockHash(int height) = 0;
-
         //! Check that the block is available on disk (i.e. has not been
         //! pruned), and contains transactions.
         virtual bool haveBlockOnDisk(int height) = 0;
@@ -161,6 +158,9 @@
     //! included in the current chain.
     virtual Optional<int> getBlockHeight(const BlockHash &hash) = 0;
 
+    //! Get block hash. Height must be valid or this function will abort.
+    virtual BlockHash getBlockHash(int height) = 0;
+
     //! Return whether node has the block and optionally return block metadata
     //! or contents.
     virtual bool findBlock(const BlockHash &hash,
diff --git a/src/interfaces/chain.cpp b/src/interfaces/chain.cpp
--- a/src/interfaces/chain.cpp
+++ b/src/interfaces/chain.cpp
@@ -66,12 +66,6 @@
     }
 
     class LockImpl : public Chain::Lock, public UniqueLock<RecursiveMutex> {
-        BlockHash getBlockHash(int height) override {
-            LockAssertion lock(::cs_main);
-            CBlockIndex *block = ::ChainActive()[height];
-            assert(block != nullptr);
-            return block->GetBlockHash();
-        }
         bool haveBlockOnDisk(int height) override {
             LockAssertion lock(::cs_main);
             CBlockIndex *block = ::ChainActive()[height];
@@ -257,6 +251,12 @@
             }
             return nullopt;
         }
+        BlockHash getBlockHash(int height) override {
+            LOCK(::cs_main);
+            CBlockIndex *block = ::ChainActive()[height];
+            assert(block);
+            return block->GetBlockHash();
+        }
         bool findBlock(const BlockHash &hash,
                        const FoundBlock &block) override {
             WAIT_LOCK(cs_main, lock);
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -4313,7 +4313,7 @@
     const Optional<int> tip_height = chain.getHeight();
     if (tip_height) {
         walletInstance->m_last_block_processed =
-            locked_chain->getBlockHash(*tip_height);
+            chain.getBlockHash(*tip_height);
         walletInstance->m_last_block_processed_height = *tip_height;
     } else {
         walletInstance->m_last_block_processed.SetNull();
@@ -4375,9 +4375,8 @@
                 (ScanResult::SUCCESS !=
                  walletInstance
                      ->ScanForWalletTransactions(
-                         locked_chain->getBlockHash(rescan_height),
-                         rescan_height, {} /* max height */, reserver,
-                         true /* update */)
+                         chain.getBlockHash(rescan_height), rescan_height,
+                         {} /* max height */, reserver, true /* update */)
                      .status)) {
                 error = _("Failed to rescan the wallet during initialization");
                 return nullptr;