diff --git a/slirp/slirp.h b/slirp/slirp.h
index b8d756e555..9ee240b775 100644
--- a/slirp/slirp.h
+++ b/slirp/slirp.h
@@ -32,6 +32,7 @@ typedef char *caddr_t;
 #define WIN32_LEAN_AND_MEAN
 # include <windows.h>
 # include <winsock2.h>
+# include <ws2tcpip.h>
 # include <sys/timeb.h>
 # include <iphlpapi.h>