diff --git a/gnuviechadmin/managemails/admin.py b/gnuviechadmin/managemails/admin.py
index 68a3c12..ca20457 100644
--- a/gnuviechadmin/managemails/admin.py
+++ b/gnuviechadmin/managemails/admin.py
@@ -10,7 +10,7 @@ PASSWORD_MISMATCH_ERROR = _("Passwords don't match")
 
 
 class ReadOnlyPasswordHashWidget(forms.Widget):
-    def render(self, name, value, attrs):
+    def render(self, name, value, attrs, renderer=None):
         final_attrs = self.build_attrs(attrs)
         summary = format_html("<strong>{0}</strong>: {1} ", _("Hash"), value)
         return format_html("<div{0}>{1}</div>", flatatt(final_attrs), summary)