diff --git a/r2/r2/controllers/wiki.py b/r2/r2/controllers/wiki.py
index 7ce4206df..b3e98966d 100644
--- a/r2/r2/controllers/wiki.py
+++ b/r2/r2/controllers/wiki.py
@@ -338,7 +338,7 @@ class WikiApiController(WikiController):
                     setattr(c.site, "prev_" + ATTRIBUTE_BY_PAGE[page.name] + "_id", page.revision)
                     c.site._commit()
             except ContentLengthError as e:
-                self.handle_error(403, 'CONTENT_LENGTH_ERROR', e.max_length)
+                self.handle_error(403, 'CONTENT_LENGTH_ERROR', max_length=e.max_length)
         return json.dumps({})
     
     def pre(self):