diff --git a/ngprogress/ngprogress.d.ts b/ngprogress/ngprogress.d.ts
index fdcdd28cb..20b06d9d6 100644
--- a/ngprogress/ngprogress.d.ts
+++ b/ngprogress/ngprogress.d.ts
@@ -15,6 +15,10 @@ declare module NgProgress {
         reset(): void;
         complete(): void;
     }
+    
+    export interface INgProgressFactory {
+        createInstance(): INgProgress;
+    }
 
 }