diff --git a/src/servala/core/crd.py b/src/servala/core/crd.py
index f4d9661..3a27c0b 100644
--- a/src/servala/core/crd.py
+++ b/src/servala/core/crd.py
@@ -268,7 +268,7 @@ class CrdModelFormMixin:
                     if not top_level_fieldsets.get(fieldset_key):
                         top_level_fieldsets[fieldset_key] = {
                             "fields": [],
-                            "fieldsets": [],
+                            "fieldsets": {},
                             "title": f"{deslugify(parts[2])}",
                         }
                     top_level_fieldsets[fieldset_key]["fields"].append(field_name)