diff --git a/docshell/base/nsDocShell.cpp b/docshell/base/nsDocShell.cpp
index bdaf641fb886..3ecd17735a76 100644
--- a/docshell/base/nsDocShell.cpp
+++ b/docshell/base/nsDocShell.cpp
@@ -153,7 +153,8 @@ NS_IMETHODIMP nsDocShell::GetDocument(nsIDOMDocument** aDocument)
   NS_ENSURE_TRUE(doc, NS_ERROR_NULL_POINTER);
 
   // the result's addref comes from this QueryInterface call
-  NS_ENSURE_SUCCESS(CallQueryInterface(doc, aDocument), NS_ERROR_FAILURE);
+  NS_ENSURE_SUCCESS(doc->QueryInterface(NS_GET_IID(nsIDOMDocument), 
+   (void**)aDocument), NS_ERROR_FAILURE);
 
   return NS_OK;
 }