diff --git a/src/main/java/vn/zalopay/benchmark/core/ClientCaller.java b/src/main/java/vn/zalopay/benchmark/core/ClientCaller.java
index f566c10f..9033d937 100644
--- a/src/main/java/vn/zalopay/benchmark/core/ClientCaller.java
+++ b/src/main/java/vn/zalopay/benchmark/core/ClientCaller.java
@@ -112,7 +112,7 @@ public boolean isTerminated() {
     public String buildRequest(String jsonData) {
         try {
             requestMessages = Reader.create(methodDescriptor.getInputType(), jsonData, registry).read();
-            return JsonFormat.printer().print(requestMessages.get(0));
+            return JsonFormat.printer().includingDefaultValueFields().print(requestMessages.get(0));
         } catch (Exception e) {
             shutdownNettyChannel();
             throw new RuntimeException("Caught exception while parsing request for rpc", e);