diff --git a/src/bench/wallet_migration.cpp b/src/bench/wallet_migration.cpp
index 910ad1e906c..7d7aca113d1 100644
--- a/src/bench/wallet_migration.cpp
+++ b/src/bench/wallet_migration.cpp
@@ -29,40 +29,42 @@ static void WalletMigration(benchmark::Bench& bench)
 
     // Setup legacy wallet
     std::unique_ptr<CWallet> wallet = std::make_unique<CWallet>(test_setup->m_node.chain.get(), "", CreateMockableWalletDatabase());
-    LegacyDataSPKM* legacy_spkm = wallet->GetOrCreateLegacyDataSPKM();
-    WalletBatch batch{wallet->GetDatabase()};
+    {
+        LegacyDataSPKM* legacy_spkm = wallet->GetOrCreateLegacyDataSPKM();
+        WalletBatch batch{wallet->GetDatabase()};
 
-    // Write a best block record as migration expects one to exist
-    CBlockLocator loc;
-    batch.WriteBestBlock(loc);
+        // Write a best block record as migration expects one to exist
+        CBlockLocator loc;
+        batch.WriteBestBlock(loc);
 
-    // Add watch-only addresses
-    std::vector<CScript> scripts_watch_only;
-    for (int w = 0; w < NUM_WATCH_ONLY_ADDR; ++w) {
-        CKey key = GenerateRandomKey();
-        LOCK(wallet->cs_wallet);
-        const PKHash dest{key.GetPubKey()};
-        const CScript& script = scripts_watch_only.emplace_back(GetScriptForDestination(dest));
-        assert(legacy_spkm->LoadWatchOnly(script));
-        assert(wallet->SetAddressBook(dest, strprintf("watch_%d", w), /*purpose=*/std::nullopt));
-        batch.WriteWatchOnly(script, CKeyMetadata());
-    }
+        // Add watch-only addresses
+        std::vector<CScript> scripts_watch_only;
+        for (int w = 0; w < NUM_WATCH_ONLY_ADDR; ++w) {
+            CKey key = GenerateRandomKey();
+            LOCK(wallet->cs_wallet);
+            const PKHash dest{key.GetPubKey()};
+            const CScript& script = scripts_watch_only.emplace_back(GetScriptForDestination(dest));
+            assert(legacy_spkm->LoadWatchOnly(script));
+            assert(wallet->SetAddressBook(dest, strprintf("watch_%d", w), /*purpose=*/std::nullopt));
+            batch.WriteWatchOnly(script, CKeyMetadata());
+        }
 
-    // Generate transactions and local addresses
-    for (int j = 0; j < 500; ++j) {
-        CKey key = GenerateRandomKey();
-        CPubKey pubkey = key.GetPubKey();
-        // Load key, scripts and create address book record
-        Assert(legacy_spkm->LoadKey(key, pubkey));
-        CTxDestination dest{PKHash(pubkey)};
-        Assert(wallet->SetAddressBook(dest, strprintf("legacy_%d", j), /*purpose=*/std::nullopt));
+        // Generate transactions and local addresses
+        for (int j = 0; j < 500; ++j) {
+            CKey key = GenerateRandomKey();
+            CPubKey pubkey = key.GetPubKey();
+            // Load key, scripts and create address book record
+            Assert(legacy_spkm->LoadKey(key, pubkey));
+            CTxDestination dest{PKHash(pubkey)};
+            Assert(wallet->SetAddressBook(dest, strprintf("legacy_%d", j), /*purpose=*/std::nullopt));
 
-        CMutableTransaction mtx;
-        mtx.vout.emplace_back(COIN, GetScriptForDestination(dest));
-        mtx.vout.emplace_back(COIN, scripts_watch_only.at(j % NUM_WATCH_ONLY_ADDR));
-        mtx.vin.resize(2);
-        wallet->AddToWallet(MakeTransactionRef(mtx), TxStateInactive{}, /*update_wtx=*/nullptr, /*rescanning_old_block=*/true);
-        batch.WriteKey(pubkey, key.GetPrivKey(), CKeyMetadata());
+            CMutableTransaction mtx;
+            mtx.vout.emplace_back(COIN, GetScriptForDestination(dest));
+            mtx.vout.emplace_back(COIN, scripts_watch_only.at(j % NUM_WATCH_ONLY_ADDR));
+            mtx.vin.resize(2);
+            wallet->AddToWallet(MakeTransactionRef(mtx), TxStateInactive{}, /*update_wtx=*/nullptr, /*rescanning_old_block=*/true);
+            batch.WriteKey(pubkey, key.GetPrivKey(), CKeyMetadata());
+        }
     }
 
     bench.epochs(/*numEpochs=*/1).epochIterations(/*numIters=*/1) // run the migration exactly once