diff --git a/when/when.d.ts b/when/when.d.ts
index 2af3fba9d..bb227cf08 100644
--- a/when/when.d.ts
+++ b/when/when.d.ts
@@ -79,4 +79,6 @@ declare module When {
     }
 }
 
-export = When;
+declare module "when" {
+    export = When;
+}