diff --git a/itpp/base/timing.cpp b/itpp/base/timing.cpp
index 58178e4..47d662e 100644
--- a/itpp/base/timing.cpp
+++ b/itpp/base/timing.cpp
@@ -51,6 +51,7 @@
 
 #if defined(_WIN32) && !defined(__CYGWIN__)
 #include <windows.h>
+#include <Winsock2.h>
 
 int gettimeofday(struct timeval* p, void*)
 {