diff --git a/heat/db/sqlalchemy/types.py b/heat/db/sqlalchemy/types.py
index 4d4a213e58..d454024c6b 100644
--- a/heat/db/sqlalchemy/types.py
+++ b/heat/db/sqlalchemy/types.py
@@ -34,6 +34,8 @@ class LongText(types.TypeDecorator):
 
 class Json(LongText):
 
+    cache_ok = True
+
     def process_bind_param(self, value, dialect):
         return dumps(value)