diff --git a/sbin/ffsinfo/ffsinfo.8 b/sbin/ffsinfo/ffsinfo.8
index 99636ea0a48e..fcdd8a218840 100644
--- a/sbin/ffsinfo/ffsinfo.8
+++ b/sbin/ffsinfo/ffsinfo.8
@@ -106,18 +106,19 @@ inode information
 indirect block dump
 .El
 .It Fl o Ar outfile
-This allows to change the output filename where the dump is written to.
-The current default is
-.Pa /var/tmp/ffsinfo .
+This allows to set the output filename where the dump is written to, and
+must be specified.
 If
 .Fl
 is provided, output will be sent to stdout.
 .El
 .Sh EXAMPLES
-.Dl ffsinfo -l 1023 /dev/vinum/testvol
+.Dl ffsinfo -o /var/tmp/ffsinfo -l 1023 /dev/vinum/testvol
 .Pp
 will dump
 .Pa /dev/vinum/testvol
+to
+.Pa /var/tmp/ffsinfo
 with all available information.
 .Sh SEE ALSO
 .Xr disklabel 8 ,
diff --git a/sbin/ffsinfo/ffsinfo.c b/sbin/ffsinfo/ffsinfo.c
index 6ee4c8df4bdf..8df4b4190d6d 100644
--- a/sbin/ffsinfo/ffsinfo.c
+++ b/sbin/ffsinfo/ffsinfo.c
@@ -141,10 +141,7 @@ main(int argc, char **argv)
 	cfg_lv=0xff;
 	cfg_in=-2;
 	cfg_cg=-2;
-	out_file=strdup("/var/tmp/ffsinfo");
-	if(out_file == NULL) {
-		errx(1, "strdup failed");
-	}
+	out_file=NULL;
 
 	while ((ch=getopt(argc, argv, "g:i:l:o:")) != -1) {
 		switch(ch) {
@@ -192,6 +189,8 @@ main(int argc, char **argv)
 		usage();
 	}
 	device=*argv;
+	if (out_file == NULL)
+		errx(1, "out_file not specified");
 	
 	/*
 	 * Now we try to guess the (raw)device name.