diff --git a/src/lib/scriptHost.d.ts b/src/lib/scriptHost.d.ts
index 2639739e5d655..bfa562a9300dd 100644
--- a/src/lib/scriptHost.d.ts
+++ b/src/lib/scriptHost.d.ts
@@ -4,7 +4,11 @@
 /// Windows Script Host APIS
 /////////////////////////////
 
-declare var ActiveXObject: { new (s: string): any; };
+
+interface ActiveXObject {
+    new (s: string): any;
+}
+declare var ActiveXObject: ActiveXObject;
 
 interface ITextWriter {
     Write(s: string): void;