diff --git a/extensions/psm-glue/public/nsISecureBrowserUI.idl b/extensions/psm-glue/public/nsISecureBrowserUI.idl
index d7dccca70b35..236e7f46b953 100644
--- a/extensions/psm-glue/public/nsISecureBrowserUI.idl
+++ b/extensions/psm-glue/public/nsISecureBrowserUI.idl
@@ -30,7 +30,7 @@ interface nsIDOMElement;
 [scriptable, uuid(081e31e0-a144-11d3-8c7c-00609792278c)]
 interface nsSecureBrowserUI : nsISupports
 {
-	void init(in nsIDOMWindowInternal window, in nsIDOMElement button, in nsIDOMElement certauth);
+	void init(in nsIDOMWindowInternal window, in nsIDOMElement button);
     void displayPageInfoUI();
 };