Index: includes/module.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/module.inc,v
retrieving revision 1.147
diff -u -p -r1.147 module.inc
--- includes/module.inc	10 Jul 2009 04:58:08 -0000	1.147
+++ includes/module.inc	23 Jul 2009 18:48:32 -0000
@@ -324,12 +324,7 @@ function module_disable($module_list) {
  */
 function module_hook($module, $hook) {
   $function = $module . '_' . $hook;
-  if (defined('MAINTENANCE_MODE')) {
-    return function_exists($function);
-  }
-  else {
-    return drupal_function_exists($function);
-  }
+  return function_exists($function) || drupal_function_exists($function);
 }
 
 /**