diff --git a/embedding/browser/webBrowser/nsCWebBrowser.idl b/embedding/browser/webBrowser/nsCWebBrowser.idl
index 495771854cce..43fbd00492a1 100644
--- a/embedding/browser/webBrowser/nsCWebBrowser.idl
+++ b/embedding/browser/webBrowser/nsCWebBrowser.idl
@@ -21,7 +21,6 @@
  */
 
 #include "nsIWebBrowser.idl"
-#include "nsIWebBrowserNav.idl"
 #include "nsIProgress.idl"
 #include "nsIBaseWindow.idl"
 #include "nsIScrollable.idl"
@@ -31,7 +30,6 @@
 nsCWebBrowser implements:
 -------------------------
 nsIWebBrowser
-nsIWebBrowserNav
 nsIProgress
 nsIBaseWindow
 nsIScrollable