diff --git a/net/sock.c b/net/sock.c
index 7cae099..1c341c8 100644
--- a/net/sock.c
+++ b/net/sock.c
@@ -52,10 +52,16 @@
 #include <arpa/inet.h>
 #include <sys/time.h>
 #include <netdb.h>
-#else
+#endif
+
+#ifdef HAVE_WINSOCK2_H
 #include <winsock2.h>
 #endif
 
+#ifdef HAVE_WS2TCPIP_H
+#include <ws2tcpip.h>
+#endif
+
 #include "sock.h"
 #include "resolver.h"
 
diff --git a/net/sock.h b/net/sock.h
index e2d5be8..7c22073 100644
--- a/net/sock.h
+++ b/net/sock.h
@@ -34,6 +34,10 @@
 #include <winsock2.h>
 #endif
 
+#ifdef HAVE_WS2TCPIP_H
+#include <ws2tcpip.h>
+#endif
+
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #elif _WIN32