diff --git a/djangorota/rota/views.py b/djangorota/rota/views.py
index 29df807..512a795 100644
--- a/djangorota/rota/views.py
+++ b/djangorota/rota/views.py
@@ -164,6 +164,10 @@ def rota_detail(request, rota_id):
 	try:
 		opts = rota.options or {}
 		for k, v in opts.items():
+			# Only surface keys that correspond to the typed RotaConstraintOptions
+			# (exclude builder/constructor args and other non-constraint keys).
+			if k not in available_constraints_rich:
+				continue
 			# pretty-print complex values where appropriate
 			try:
 				pretty = json.dumps(v, indent=2, default=str)