diff --git a/README b/README
index ffcc382..7817c39 100644
--- a/README
+++ b/README
@@ -64,7 +64,7 @@ The following tools are implemented ('*' == finished, '#' == UTF-8 support,
 =   sha1sum         non-posix                    none
 =   sha256sum       non-posix                    none
 =   sha512sum       non-posix                    none
-=*  sleep           yes                          none
+=*| sleep           yes                          none
     sort            no                           -m, -o, -d, -f, -i
 =*  split           yes                          none
 =*  sponge          non-posix                    none
diff --git a/sleep.c b/sleep.c
index 7148718..ce20858 100644
--- a/sleep.c
+++ b/sleep.c
@@ -12,18 +12,19 @@ usage(void)
 int
 main(int argc, char *argv[])
 {
-	unsigned int seconds;
+	unsigned seconds;
 
 	ARGBEGIN {
 	default:
 		usage();
 	} ARGEND;
 
-	if (argc < 1)
+	if (argc != 1)
 		usage();
 
 	seconds = estrtonum(argv[0], 0, UINT_MAX);
 	while ((seconds = sleep(seconds)) > 0)
 		;
+
 	return 0;
 }