diff --git a/tiramisu_cmdline_parser/api.py b/tiramisu_cmdline_parser/api.py
index 32a7363..c54ab99 100644
--- a/tiramisu_cmdline_parser/api.py
+++ b/tiramisu_cmdline_parser/api.py
@@ -604,9 +604,10 @@ class TiramisuCmdlineParser(ArgumentParser):
         for option_is_not_default in options_is_not_default.values():
             self._option_is_not_default(**option_is_not_default)
         for values in actions.values():
-            for value in values:
-                args, kwargs = value.get()
-                group.add_argument(*args, **kwargs)
+#            for value in values:
+            value = values[0]
+            args, kwargs = value.get()
+            group.add_argument(*args, **kwargs)
 
 #    def _valid_mandatory(self):
 #        pass