diff --git a/modules/sdk-core/src/bitgo/wallet/iWallet.ts b/modules/sdk-core/src/bitgo/wallet/iWallet.ts
index 810a8cf5b6..e68f2808b4 100644
--- a/modules/sdk-core/src/bitgo/wallet/iWallet.ts
+++ b/modules/sdk-core/src/bitgo/wallet/iWallet.ts
@@ -206,6 +206,7 @@ export interface WalletSignTransactionOptions extends WalletSignBaseOptions {
   customMPCv2SigningRound3GenerationFunction?: CustomMPCv2SigningRound3GeneratingFunction;
   apiVersion?: ApiVersion;
   multisigTypeVersion?: 'MPCv2';
+  walletPassphrase?: string;
   [index: string]: unknown;
 }
 
diff --git a/modules/sdk-core/src/bitgo/wallet/wallet.ts b/modules/sdk-core/src/bitgo/wallet/wallet.ts
index 497098b62e..20be6d5ad5 100644
--- a/modules/sdk-core/src/bitgo/wallet/wallet.ts
+++ b/modules/sdk-core/src/bitgo/wallet/wallet.ts
@@ -1717,6 +1717,21 @@ export class Wallet implements IWallet {
       params.txPrebuild = { txRequestId };
     }
 
+    if (params.walletPassphrase && !(params.keychain || params.key)) {
+      if (!_.isString(params.walletPassphrase)) {
+        throw new Error('walletPassphrase must be a string');
+      }
+      const keychains = await this.getKeychainsAndValidatePassphrase({
+        reqId: params.reqId,
+        walletPassphrase: params.walletPassphrase,
+      });
+      const userKeychain = keychains[0];
+      if (!userKeychain || !userKeychain.encryptedPrv) {
+        throw new Error('the user keychain does not have property encryptedPrv');
+      }
+      params.keychain = userKeychain;
+    }
+
     const presign = await this.baseCoin.presignTransaction({
       ...params,
       walletData: this._wallet,