diff --git a/wcs/workflows.py b/wcs/workflows.py
index 205a3a242..ce5e41fb8 100644
--- a/wcs/workflows.py
+++ b/wcs/workflows.py
@@ -2125,7 +2125,7 @@ class CommentableWorkflowStatusItem(WorkflowStatusItem):
     def fill_admin_form(self, form):
         if self.by and not type(self.by) is list:
             self.by = None
-        return super(self, CommentableWorkflowStatusItem).fill_admin_form(form)
+        return super(CommentableWorkflowStatusItem, self).fill_admin_form(form)
 
     def get_parameters(self):
         return ('label', 'button_label', 'hint', 'by', 'varname',