diff --git a/README.markdown b/README.markdown
index 7726615a2..fa8dc7702 100644
--- a/README.markdown
+++ b/README.markdown
@@ -701,8 +701,8 @@ const sendRequest: RpcImpl = (service, method, data) => {
       return argument;
     }
 
-    // Using passThrough as the serialize and deserialize functions
-    conn.makeUnaryRequest(path, passThrough, passThrough, data, resultCallback);
+    // Using passThrough as the deserialize functions
+    conn.makeUnaryRequest(path, d => Buffer.from(d), passThrough, data, resultCallback);
   });
 };