1 files changed, 3 insertions, 0 deletions
diff --git a/src/cgls/cgls.c b/src/cgls/cgls.c
index 32780c606a..a34b0aa604 100644
--- a/src/cgls/cgls.c
+++ b/src/cgls/cgls.c
@@ -93,6 +93,9 @@ static int parse_argv(int argc, char *argv[]) {
         assert(argc >= 1);
         assert(argv);
 
+        /* Resetting to 0 forces the invocation of an internal initialization routine of getopt_long()
+         * that checks for GNU extensions in optstring ('-' or '+' at the beginning). */
+        optind = 0;
         while ((c = getopt_long(argc, argv, "-hkalM:u::xc", options, NULL)) >= 0)
 
                 switch (c) {