diff --git a/kubespawner/spawner.py b/kubespawner/spawner.py
index e7f5564e..d0dee0af 100644
--- a/kubespawner/spawner.py
+++ b/kubespawner/spawner.py
@@ -1697,7 +1697,6 @@ def _validate_image_pull_secrets(self, proposal):
     )
 
     additional_profile_form_template_paths = List(
-        default=[],
         help="""
         Additional paths to search for jinja2 templates when rendering profile_form.