diff --git a/packages/sdk/src/restclient.ts b/packages/sdk/src/restclient.ts
index e3794ee1..b89e7fcb 100644
--- a/packages/sdk/src/restclient.ts
+++ b/packages/sdk/src/restclient.ts
@@ -140,7 +140,8 @@ export class RestClient {
   }
 
   // encodeTx returns the amino-encoding of the transaction
-  public async encodeTx(tx: StdTx): Promise<Uint8Array> {
+  public async encodeTx(stdTx: StdTx): Promise<Uint8Array> {
+    const tx = {"type": "cosmos-sdk/StdTx", "value": stdTx};
     const responseData = await this.post("/txs/encode", tx);
     if (!(responseData as any).tx) {
       throw new Error("Unexpected response data format");
diff --git a/packages/sdk/types/restclient.d.ts b/packages/sdk/types/restclient.d.ts
index 02c0fa53..b818be1e 100644
--- a/packages/sdk/types/restclient.d.ts
+++ b/packages/sdk/types/restclient.d.ts
@@ -71,7 +71,7 @@ export declare class RestClient {
   nodeInfo(): Promise<NodeInfoResponse>;
   blocksLatest(): Promise<BlocksResponse>;
   blocks(height: number): Promise<BlocksResponse>;
-  encodeTx(tx: StdTx): Promise<Uint8Array>;
+  encodeTx(stdTx: StdTx): Promise<Uint8Array>;
   authAccounts(address: string, height?: string): Promise<AuthAccountsResponse>;
   txs(query: string): Promise<SearchTxsResponse>;
   txsById(id: string): Promise<TxsResponse>;