diff --git a/libnetutil/netutil.cc b/libnetutil/netutil.cc
index d210b5d80..0f2449dcb 100644
--- a/libnetutil/netutil.cc
+++ b/libnetutil/netutil.cc
@@ -101,8 +101,16 @@
 #include <assert.h>
 #include <errno.h>
 #include <sys/types.h>
+#include <sys/socket.h>
 #include <net/if_arp.h>
 
+#include <netinet/in.h>
+
+#ifndef NETINET_IN_SYSTEM_H  /* why the HELL does OpenBSD not do this? */
+#include <netinet/in_systm.h>
+#define NETINET_IN_SYSTEM_H
+#endif
+
 #if HAVE_NET_IF_H
 #ifndef NET_IF_H /* why doesn't OpenBSD do this? */
 #include <net/if.h>