diff --git a/docbow_project/docbow/views.py b/docbow_project/docbow/views.py
index cf82552..e85de29 100644
--- a/docbow_project/docbow/views.py
+++ b/docbow_project/docbow/views.py
@@ -514,6 +514,7 @@ def delegate(request, domain_override=None,):
                         delegate_username = get_free_delegation_number(request.user)
                         delegate_user = User(username=delegate_username,
                                 **form.cleaned_data)
+                        delegate_user.set_unusable_password()
                         delegate_user.save()
                         Delegation.objects.get_or_create(by=request.user,
                                 to=delegate_user, guest_delegate=True)