diff -up shadow-4.0.18.1/src/useradd.c.bflg shadow-4.0.18.1/src/useradd.c
--- shadow-4.0.18.1/src/useradd.c.bflg	2008-04-08 14:50:43.000000000 +0200
+++ shadow-4.0.18.1/src/useradd.c	2008-04-08 14:50:53.000000000 +0200
@@ -1051,9 +1051,6 @@ static void process_flags (int argc, cha
 				     long_options, NULL)) != -1) {
 			switch (c) {
 			case 'b':
-				if (!Dflg)
-					usage ();
-
 				if (!VALID (optarg)
 				    || optarg[0] != '/') {
 					fprintf (stderr,