diff --git a/usr.bin/elf2aout/elf2aout.1 b/usr.bin/elf2aout/elf2aout.1
index 7b153e9b2432..0f4be221348d 100644
--- a/usr.bin/elf2aout/elf2aout.1
+++ b/usr.bin/elf2aout/elf2aout.1
@@ -32,7 +32,7 @@
 .Nd "Convert ELF binary to a.out format"
 .Sh SYNOPSIS
 .Nm
-.Op Fl o outfile
+.Op Fl o Ar outfile
 .Ar infile
 .Sh DESCRIPTION
 The
diff --git a/usr.bin/elf2aout/elf2aout.c b/usr.bin/elf2aout/elf2aout.c
index 4168f4e60560..7e1ece66deed 100644
--- a/usr.bin/elf2aout/elf2aout.c
+++ b/usr.bin/elf2aout/elf2aout.c
@@ -35,6 +35,8 @@ __FBSDID("$FreeBSD$");
 
 #include <err.h>
 #include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 
@@ -155,5 +157,6 @@ static void
 usage(void)
 {
 
-	errx(1, "usage: elf2aout [-o outfile] infile");
+	fprintf(stderr, "usage: elf2aout [-o outfile] infile\n");
+	exit(1);
 }