diff --git a/ws/ixcobra/IXCobraConnection.cpp b/ws/ixcobra/IXCobraConnection.cpp
index 24d0bd1d..681d55e3 100644
--- a/ws/ixcobra/IXCobraConnection.cpp
+++ b/ws/ixcobra/IXCobraConnection.cpp
@@ -245,7 +245,7 @@ namespace ix
         Json::Value pdu;
         pdu["action"] = "auth/handshake";
         pdu["body"] = body;
-        pdu["id"] = _id++;
+        pdu["id"] = Json::UInt64(_id++);
 
         std::string serializedJson = serializeJson(pdu);
         CobraConnection::invokeTrafficTrackerCallback(serializedJson.size(), false);
@@ -308,7 +308,7 @@ namespace ix
         Json::Value pdu;
         pdu["action"] = "auth/authenticate";
         pdu["body"] = body;
-        pdu["id"] = _id++;
+        pdu["id"] = Json::UInt64(_id++);
 
         std::string serializedJson = serializeJson(pdu);
         CobraConnection::invokeTrafficTrackerCallback(serializedJson.size(), false);
@@ -405,7 +405,7 @@ namespace ix
         _body["channels"] = channels;
         _body["message"] = msg;
         _pdu["body"] = _body;
-        _pdu["id"] = _id++;
+        _pdu["id"] = Json::UInt64(_id++);
 
         std::string serializedJson = serializeJson(_pdu);
 
@@ -448,7 +448,7 @@ namespace ix
         Json::Value pdu;
         pdu["action"] = "rtm/subscribe";
         pdu["body"] = body;
-        pdu["id"] = _id++;
+        pdu["id"] = Json::UInt64(_id++);
 
         _webSocket->send(pdu.toStyledString());
 
@@ -474,7 +474,7 @@ namespace ix
         Json::Value pdu;
         pdu["action"] = "rtm/unsubscribe";
         pdu["body"] = body;
-        pdu["id"] = _id++;
+        pdu["id"] = Json::UInt64(_id++);
 
         _webSocket->send(pdu.toStyledString());
     }