--- xdu-3.0/xdu.c.formatstring	2014-10-04 09:25:04.000000000 +0200
+++ xdu-3.0/xdu.c	2014-10-04 11:34:21.915476959 +0200
@@ -201,7 +201,7 @@
 	xsetup(&argc,argv);
 	if (argc == 1) {
 		if (isatty(fileno(stdin))) {
-			fprintf(stderr, usage);
+			fprintf(stderr, "%s", usage);
 			exit(1);
 		} else {
 			parse_file("-");
@@ -209,7 +209,7 @@
 	} else if (argc == 2 && strcmp(argv[1],"-help") != 0) {
 		parse_file(argv[1]);
 	} else {
-		fprintf(stderr, usage);
+		fprintf(stderr, "%s", usage);
 		exit(1);
 	}
 	top.size = fix_tree(&top);