diff --git a/cpp/tensorrt_llm/executor/serialization.cpp b/cpp/tensorrt_llm/executor/serialization.cpp
index f6d50cc936..eb2a7019a6 100644
--- a/cpp/tensorrt_llm/executor/serialization.cpp
+++ b/cpp/tensorrt_llm/executor/serialization.cpp
@@ -946,15 +946,18 @@ Response Serialization::deserializeResponse(std::istream& is)
 {
     auto requestId = su::deserialize<IdType>(is);
     auto errOrResult = su::deserialize<std::variant<std::string, Result>>(is);
+    auto clientId = su::deserialize<std::optional<IdType>>(is);
 
-    return std::holds_alternative<std::string>(errOrResult) ? Response{requestId, std::get<std::string>(errOrResult)}
-                                                            : Response{requestId, std::get<Result>(errOrResult)};
+    return std::holds_alternative<std::string>(errOrResult)
+        ? Response{requestId, std::get<std::string>(errOrResult), clientId}
+        : Response{requestId, std::get<Result>(errOrResult), clientId};
 }
 
 void Serialization::serialize(Response const& response, std::ostream& os)
 {
     su::serialize(response.mImpl->mRequestId, os);
     su::serialize(response.mImpl->mErrOrResult, os);
+    su::serialize(response.mImpl->mClientId, os);
 }
 
 size_t Serialization::serializedSize(Response const& response)
@@ -962,6 +965,7 @@ size_t Serialization::serializedSize(Response const& response)
     size_t totalSize = 0;
     totalSize += su::serializedSize(response.mImpl->mRequestId);
     totalSize += su::serializedSize(response.mImpl->mErrOrResult);
+    totalSize += su::serializedSize(response.mImpl->mClientId);
     return totalSize;
 }
 
diff --git a/cpp/tests/unit_tests/executor/serializeUtilsTest.cpp b/cpp/tests/unit_tests/executor/serializeUtilsTest.cpp
index 1d618c86da..bd7aacfcb6 100644
--- a/cpp/tests/unit_tests/executor/serializeUtilsTest.cpp
+++ b/cpp/tests/unit_tests/executor/serializeUtilsTest.cpp
@@ -160,6 +160,7 @@ void compareResponse(texec::Response res, texec::Response res2)
     {
         compareResult(res.getResult(), res2.getResult());
     }
+    EXPECT_EQ(res.getClientId(), res2.getClientId());
 }
 
 template <typename T>
@@ -428,11 +429,15 @@ TEST(SerializeUtilsTest, ResultResponse)
         auto val = texec::Response(1, "my error msg");
         testSerializeDeserialize(val);
     }
+    {
+        auto val = texec::Response(1, "my error msg", 2);
+        testSerializeDeserialize(val);
+    }
 }
 
 TEST(SerializeUtilsTest, VectorResponses)
 {
-    int numResponses = 10;
+    int numResponses = 15;
     std::vector<texec::Response> responsesIn;
     for (int i = 0; i < numResponses; ++i)
     {
@@ -443,11 +448,16 @@ TEST(SerializeUtilsTest, VectorResponses)
                 std::nullopt, std::vector<texec::FinishReason>{texec::FinishReason::kEND_ID}};
             responsesIn.emplace_back(i, res);
         }
-        else
+        else if (i < 10)
         {
             std::string errMsg = "my_err_msg" + std::to_string(i);
             responsesIn.emplace_back(i, errMsg);
         }
+        else
+        {
+            std::string errMsg = "my_err_msg" + std::to_string(i);
+            responsesIn.emplace_back(i, errMsg, i + 1);
+        }
     }
 
     auto buffer = texec::Serialization::serialize(responsesIn);