diff --git a/proposals/4140-delayed-events-futures.md b/proposals/4140-delayed-events-futures.md
index 3a75574b0..dc7b9c23a 100644
--- a/proposals/4140-delayed-events-futures.md
+++ b/proposals/4140-delayed-events-futures.md
@@ -699,7 +699,7 @@ will be stored with the following outcome:
 "outcome": "cancel",
 "reason": "error",
 "error": {
-  "errorcode": "M_CANCELLED_BY_STATE_UPDATE",
+  "errcode": "M_CANCELLED_BY_STATE_UPDATE",
   "error":"The delayed event did not get sent because a different user updated the same state event.
   So the scheduled event might change it in an undesired way."
 }