diff --git a/usr.sbin/yp_mkdb/yp_mkdb.c b/usr.sbin/yp_mkdb/yp_mkdb.c
index d49448c9aae..a5fed00631d 100644
--- a/usr.sbin/yp_mkdb/yp_mkdb.c
+++ b/usr.sbin/yp_mkdb/yp_mkdb.c
@@ -118,7 +118,7 @@ int main (argc, argv)
 	FILE *ifp;
 	char hname[MAXHOSTNAMELEN + 2];
 
-	while ((ch = getopt(argc, argv, "uhcbsd:fi:o:m:")) != -1) {
+	while ((ch = getopt(argc, argv, "uhcbsfd:i:o:m:")) != -1) {
 		switch(ch) {
 		case 'f':
 			filter_plusminus++;