diff --git a/src/github.com/matrix-org/dendrite/tools/create-room-events/main.go b/src/github.com/matrix-org/dendrite/tools/create-room-events/main.go
index 0359a2bed..df0fd8373 100644
--- a/src/github.com/matrix-org/dendrite/tools/create-room-events/main.go
+++ b/src/github.com/matrix-org/dendrite/tools/create-room-events/main.go
@@ -150,6 +150,6 @@ func writeEvent(event gomatrixserverlib.Event) {
 			panic(err)
 		}
 	} else {
-		panic(fmt.Errorf("Format %q is not valid, must be %q or %q", format, "RAW", "INPUT"))
+		panic(fmt.Errorf("Format %q is not valid, must be %q or %q", format, "InputRoomEvent", "Event"))
 	}
 }