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-rw-r--r--src/sleep.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/sleep.c b/src/sleep.c
index 9e986930c..9c96ab38d 100644
--- a/src/sleep.c
+++ b/src/sleep.c
@@ -120,7 +120,7 @@ main (int argc, char **argv)
atexit (close_stdout);
parse_long_options (argc, argv, PROGRAM_NAME, GNU_PACKAGE, VERSION,
- usage, AUTHORS, NULL);
+ usage, AUTHORS, (char const *) NULL);
while ((c = getopt_long (argc, argv, "", long_options, NULL)) != -1)
{