diff --git a/lib/appenders/gelf.js b/lib/appenders/gelf.js
index 8e075b5..e3df4f1 100644
--- a/lib/appenders/gelf.js
+++ b/lib/appenders/gelf.js
@@ -96,8 +96,7 @@ function gelfAppender (layout, host, port, hostname, facility) {
   function preparePacket(loggingEvent) {
     var msg = {};
     addCustomFields(loggingEvent, msg);
-    msg.full_message = layout(loggingEvent);
-    msg.short_message = msg.full_message;
+    msg.short_message = layout(loggingEvent);
     
     msg.version="1.0";
     msg.timestamp = msg.timestamp || new Date().getTime() / 1000; // log should use millisecond