diff --git a/mozilla/docshell/base/nsIDocShell.idl b/mozilla/docshell/base/nsIDocShell.idl
index 4d7b0496997..95f6c3d9743 100644
--- a/mozilla/docshell/base/nsIDocShell.idl
+++ b/mozilla/docshell/base/nsIDocShell.idl
@@ -96,7 +96,7 @@ interface nsIDocShell : nsISupports
 	/*
 	Prefs to use for the DocShell.
 	*/
-	attribute nsIPref Prefs;
+	attribute nsIPref prefs;
 
 	/*
 	Returns the root DocShell instance.  Since DocShells can be nested