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-rw-r--r--src/expr.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/expr.c b/src/expr.c
index 8b7562162..f75fb8ed9 100644
--- a/src/expr.c
+++ b/src/expr.c
@@ -188,7 +188,7 @@ 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);
/* The above handles --help and --version.
Since there is no other invocation of getopt, handle `--' here. */
if (argc > 1 && STREQ (argv[1], "--"))