diff --git a/usr.bin/elf2aout/elf2aout.c b/usr.bin/elf2aout/elf2aout.c
index 71df171163db..a03968fdbd81 100644
--- a/usr.bin/elf2aout/elf2aout.c
+++ b/usr.bin/elf2aout/elf2aout.c
@@ -29,17 +29,13 @@ __FBSDID("$FreeBSD$");
 
 #include <sys/types.h>
 #include <sys/elf64.h>
+#include <sys/endian.h>
 #include <sys/mman.h>
 #include <sys/stat.h>
 
 #include <err.h>
 #include <fcntl.h>
 
-#define	be16toh(x)	(x)
-#define	be32toh(x)	(x)
-#define	be64toh(x)	(x)
-#define	htobe32(x)	(x)
-
 struct exec {
 	u_int	a_magic;
 	u_int	a_text;
diff --git a/usr.sbin/elf2aout/elf2aout.c b/usr.sbin/elf2aout/elf2aout.c
index 71df171163db..a03968fdbd81 100644
--- a/usr.sbin/elf2aout/elf2aout.c
+++ b/usr.sbin/elf2aout/elf2aout.c
@@ -29,17 +29,13 @@ __FBSDID("$FreeBSD$");
 
 #include <sys/types.h>
 #include <sys/elf64.h>
+#include <sys/endian.h>
 #include <sys/mman.h>
 #include <sys/stat.h>
 
 #include <err.h>
 #include <fcntl.h>
 
-#define	be16toh(x)	(x)
-#define	be32toh(x)	(x)
-#define	be64toh(x)	(x)
-#define	htobe32(x)	(x)
-
 struct exec {
 	u_int	a_magic;
 	u_int	a_text;