diff --git a/gruntjs/gruntjs.d.ts b/gruntjs/gruntjs.d.ts
index 5ff8eab9f..2e24ff033 100644
--- a/gruntjs/gruntjs.d.ts
+++ b/gruntjs/gruntjs.d.ts
@@ -8,7 +8,7 @@
 /// To add plugins update the IGruntConfig using open ended interface syntax
 ////////////////
 interface IGruntConfig{
-    pkg: any;
+    pkg?: any;
 }
 
 ////////////////
@@ -162,4 +162,4 @@ interface IGruntFileObject{
 ////////////////
 declare var module : {
     exports: {(grunt: IGrunt): void;};
-}
\ No newline at end of file
+}