diff --git a/chrono/api/serializers.py b/chrono/api/serializers.py
index 85de836c..2974ea46 100644
--- a/chrono/api/serializers.py
+++ b/chrono/api/serializers.py
@@ -161,8 +161,8 @@ class EventSerializer(serializers.ModelSerializer):
 
 
 class AgendaSerializer(serializers.ModelSerializer):
-    edit_role = serializers.CharField(required=False)
-    view_role = serializers.CharField(required=False)
+    edit_role = serializers.CharField(required=False, max_length=150)
+    view_role = serializers.CharField(required=False, max_length=150)
 
     class Meta:
         model = Agenda