diff --git a/actions/showgroup.php b/actions/showgroup.php
index 1f66b7514c..f404c648d7 100644
--- a/actions/showgroup.php
+++ b/actions/showgroup.php
@@ -52,6 +52,17 @@ class ShowgroupAction extends Action
     /** page we're viewing. */
     var $page = null;
 
+    /**
+     * Is this page read-only?
+     *
+     * @return boolean true
+     */
+
+    function isReadOnly()
+    {
+        return true;
+    }
+
     /**
      * Title of the page
      *