diff --git a/playground/nutech/receipt/timertfc-schema.json b/playground/nutech/receipt/timertfc-schema.json
index 76667877..c67355a0 100644
--- a/playground/nutech/receipt/timertfc-schema.json
+++ b/playground/nutech/receipt/timertfc-schema.json
@@ -7,7 +7,7 @@
   ],
   "properties": {
     "timer_value_tfc": {
-      "type": "integer",
+      "type": "str",
       "title": "Timer Value",
       "default":"PT"
     },