diff --git a/lib/roken/roken.h.in b/lib/roken/roken.h.in
index 643aae78d..2bd471736 100644
--- a/lib/roken/roken.h.in
+++ b/lib/roken/roken.h.in
@@ -124,6 +124,10 @@ struct sockaddr_dl;
 #include <time.h>
 #endif
 
+#ifdef HAVE_WS2TCPIP_H
+#include <ws2tcpip.h>
+#endif
+
 #ifdef HAVE_PATHS_H
 #include <paths.h>
 #endif