diff --git a/webshell/public/nsIDocumentLoader.h b/webshell/public/nsIDocumentLoader.h
index 34758f4592c..8b523b3f73f 100644
--- a/webshell/public/nsIDocumentLoader.h
+++ b/webshell/public/nsIDocumentLoader.h
@@ -28,8 +28,10 @@
 class nsString;
 class nsIURL;
 class nsIFactory;
+class nsIPostData;
 class nsIDocumentWidget;
 class nsIStreamListener;
+class nsIStreamObserver;
 
 
 /* f43ba260-0737-11d2-beb9-00805f8a66dc */