use posix correct optstring

diff --git a/doas.c b/doas.c
index c1b822b56d9d7f32faa18496bf91d131bcbb314b..05d2b93707dabe49276ae2cd3e37db7d4731d0e4 100644 (file)
--- a/doas.c
+++ b/doas.c
@@ -256,7 +256,7 @@ main(int argc, char **argv)
 #ifdef HAVE_BSD_AUTH_H
 # define OPTSTRING "a:C:nsu:v"
 #else
-# define OPTSTRING "C:nsu:v"
+# define OPTSTRING "+C:nsu:v"
 #endif
 
        while ((ch = getopt(argc, argv, OPTSTRING)) != -1) {