diff --git a/ChangeLog b/ChangeLog
index c23bf9bae..e83a4cd9b 100755
--- a/ChangeLog
+++ b/ChangeLog
@@ -7,7 +7,8 @@ $Source$
 
 2006-02-08 Marc Delisle  <lem9@users.sourceforge.net>
     * libraries/Config.class.php: leave the possibility of having a
-      backslash in the path on non-Windows system, thanks to Michal
+      backslash in the path on non-Windows system, thanks to Michal;
+      and bug #1418769, part 2: missing argument (PHP 4 constructor)
 
 2006-02-06 Michal Čihař  <michal@cihar.com>
     * scripts/setup.php: Fix typos (bug #1424923).
diff --git a/libraries/Config.class.php b/libraries/Config.class.php
index c933284fd..e5d78b0ef 100644
--- a/libraries/Config.class.php
+++ b/libraries/Config.class.php
@@ -476,7 +476,7 @@ class PMA_Config
      *
      * @deprecated
      */
-    function PMA_Config($source)
+    function PMA_Config($source = null)
     {
         $this->__construct($source);
     }