diff --git a/configure.ac b/configure.ac
index 9cba9542a..8adfcb347 100644
--- a/configure.ac
+++ b/configure.ac
@@ -413,6 +413,7 @@ AC_CHECK_HEADERS([ \
 	string.h \
 	strings.h \
 	sys/bitypes.h \
+	sys/byteorder.h \
 	sys/bsdtty.h \
 	sys/cdefs.h \
 	sys/dir.h \
diff --git a/regress/netcat.c b/regress/netcat.c
index 2d86818e2..08e642bc0 100644
--- a/regress/netcat.c
+++ b/regress/netcat.c
@@ -64,6 +64,9 @@
 #ifdef HAVE_ERR_H
 # include <err.h>
 #endif
+#ifndef HAVE_SYS_BYTEORDER_H
+# include <sys/byteorder.h>
+#endif
 
 /* Telnet options from arpa/telnet.h */
 #define IAC	255