diff --git a/slirp/slirp.h b/slirp/slirp.h
index 1bb189d4b7..1ff68cb0b4 100644
--- a/slirp/slirp.h
+++ b/slirp/slirp.h
@@ -20,6 +20,7 @@ typedef uint32_t u_int32_t;
 typedef uint64_t u_int64_t;
 typedef char *caddr_t;
 
+# include <windows.h>
 # include <winsock2.h>
 # include <sys/timeb.h>
 # include <iphlpapi.h>