1 files changed, 1 insertions, 1 deletions
diff --git a/src/factor.c b/src/factor.c
index 79adc2882..9a30ce771 100644
--- a/src/factor.c
+++ b/src/factor.c
@@ -202,7 +202,7 @@ main (int argc, char **argv)
 
   parse_long_options (argc, argv, PROGRAM_NAME, GNU_PACKAGE, VERSION,
 		      usage, AUTHORS, (char const *) NULL);
-  if (getopt (argc, argv, "") != -1)
+  if (getopt_long (argc, argv, "", NULL, NULL) != -1)
     usage (EXIT_FAILURE);
 
   if (argc <= optind)