diff --git a/modoboa/core/app_settings.py b/modoboa/core/app_settings.py
index 0dfd9c6f0..2154fce50 100644
--- a/modoboa/core/app_settings.py
+++ b/modoboa/core/app_settings.py
@@ -96,6 +96,16 @@ GLOBAL_PARAMETERS_STRUCT = collections.OrderedDict(
                                 ),
                             },
                         ),
+                        (
+                            "allow_special_characters",
+                            {
+                                "label": gettext_lazy("Allow special characters for random password"),
+                                "help_text": gettext_lazy(
+                                    "Enable special characters in randomly generated "
+                                    "passwords."
+                                ),
+                            }
+                        ),
                         (
                             "update_password_url",
                             {