diff --git a/playground/cris-tolbert/vacation-approval/approval-schema.json b/playground/cris-tolbert/vacation-approval/approval-schema.json
index 4d28918e..751dafcc 100644
--- a/playground/cris-tolbert/vacation-approval/approval-schema.json
+++ b/playground/cris-tolbert/vacation-approval/approval-schema.json
@@ -7,7 +7,7 @@
       "title": "I approve!",
       "default": false
     }
-    "notapproved": {
+    "not_approved": {
       "type": "boolean",
       "title": "I approve!",
       "default": false