diff --git a/packages/providers/src/json-rpc-provider.ts b/packages/providers/src/json-rpc-provider.ts
index 3b577552f9..33eb6f2b81 100644
--- a/packages/providers/src/json-rpc-provider.ts
+++ b/packages/providers/src/json-rpc-provider.ts
@@ -123,7 +123,8 @@ export class JsonRpcProvider extends Provider {
      */
     async sendTransactionAsync(signedTransaction: SignedTransaction): Promise<FinalExecutionOutcome> {
         const bytes = encodeTransaction(signedTransaction);
-        return this.sendJsonRpc('broadcast_tx_async', [Buffer.from(bytes).toString('base64')]);
+        const buffer = [Buffer.from(bytes).toString('base64')];
+        return this.sendJsonRpc('broadcast_tx_async', buffer);
     }
 
     /**