diff --git a/sys/netinet/tcp_var.h b/sys/netinet/tcp_var.h
--- a/sys/netinet/tcp_var.h
+++ b/sys/netinet/tcp_var.h
@@ -1576,6 +1576,7 @@
 	th->th_win = htons(th->th_win);
 	th->th_urp = htons(th->th_urp);
 }
+#endif /* _KERNEL */
 
 static inline uint16_t
 tcp_get_flags(const struct tcphdr *th)
@@ -1589,6 +1590,4 @@
         th->th_x2    = (flags >> 8) & 0x0f;
         th->th_flags = flags & 0xff;
 }
-#endif /* _KERNEL */
-
 #endif /* _NETINET_TCP_VAR_H_ */