diff --git a/external/3rd/library/udplibrary/UdpLibrary.cpp b/external/3rd/library/udplibrary/UdpLibrary.cpp
index 3612cdf9..a84e147d 100644
--- a/external/3rd/library/udplibrary/UdpLibrary.cpp
+++ b/external/3rd/library/udplibrary/UdpLibrary.cpp
@@ -3,13 +3,9 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
-#include <limits.h>
 
 #include "UdpLibrary.hpp"
 
-#define LEFT_SHIFT(a, b) ((b) >= CHAR_BIT * sizeof(a)? 0 : (a) << (b))
-
-
 #if defined(WIN32)
 	#pragma warning(disable : 4710)
 	#if defined(UDPLIBRARY_WINSOCK2)