diff --git a/types/rdf-data-model/index.d.ts b/types/rdf-data-model/index.d.ts
index 9c15063eee..ea82a0e8f7 100644
--- a/types/rdf-data-model/index.d.ts
+++ b/types/rdf-data-model/index.d.ts
@@ -2,6 +2,7 @@
 // Project: https://github.com/rdf-ext/rdf-data-model
 // Definitions by: Ruben Taelman <https://github.com/rubensworks>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.3
 
 import * as RDF from "rdf-js";