diff --git a/src/wallet/wallet.h b/src/wallet/wallet.h
index 965ab5b22..15be2072d 100644
--- a/src/wallet/wallet.h
+++ b/src/wallet/wallet.h
@@ -827,6 +827,7 @@ protected:
             return;
         }
         try {
+            LOCK(cs_wallet);
             for (std::pair<const uint256, CWalletTx>& wtxItem : mapWallet) {
                 auto wtx = wtxItem.second;
                 // We skip transactions for which mapSaplingNoteData