diff --git a/ext/nokogiri/nokogiri.h b/ext/nokogiri/nokogiri.h
index 3237554835b..2dad57633bb 100644
--- a/ext/nokogiri/nokogiri.h
+++ b/ext/nokogiri/nokogiri.h
@@ -1,6 +1,18 @@
 #ifndef NOKOGIRI_NATIVE
 #define NOKOGIRI_NATIVE
 
+#if _MSC_VER
+#ifndef WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN
+#endif /* WIN32_LEAN_AND_MEAN */
+#ifndef WIN32
+#define WIN32
+#endif /* WIN32 */
+#include <winsock2.h>
+#include <ws2tcpip.h>
+#include <windows.h>
+#endif
+
 #include <stdlib.h>
 #include <string.h>
 #include <assert.h>