diff --git a/common/modules/config.jsm b/common/modules/config.jsm
index 7495d27c..9fbd1e54 100644
--- a/common/modules/config.jsm
+++ b/common/modules/config.jsm
@@ -64,7 +64,7 @@ var ConfigBase = Class("ConfigBase", {
                         <broadcaster id={"pentadactyl-" + id + "Sidebar"}
                             autoCheck="false" type="checkbox" group="sidebar"
                             sidebartitle={name} sidebarurl={uri}
-                            oncommand="toggleSidebar(this.id);" xmlns={XUL}/>
+                            oncommand="toggleSidebar(this.observes);" xmlns={XUL}/>
             }
 
             util.overlayWindow(window, { append: append.elements() });