diff --git a/toolkit/components/places/public/nsIBrowserHistory.idl b/toolkit/components/places/public/nsIBrowserHistory.idl
index 6c6e2df6b5f..10d486d7b11 100644
--- a/toolkit/components/places/public/nsIBrowserHistory.idl
+++ b/toolkit/components/places/public/nsIBrowserHistory.idl
@@ -81,7 +81,7 @@ interface nsIBrowserHistory : nsISupports
      * lastPageVisited
      * the most recently visited page
      */
-    readonly attribute string lastPageVisited;
+    attribute string lastPageVisited;
 
 
     /**