Index: modules/user/user.pages.inc
===================================================================
RCS file: /cvs/drupal/drupal/modules/user/user.pages.inc,v
retrieving revision 1.48
diff -p -u -p -r1.48 user.pages.inc
--- modules/user/user.pages.inc	12 Aug 2009 12:36:05 -0000	1.48
+++ modules/user/user.pages.inc	19 Aug 2009 23:43:05 -0000
@@ -266,6 +266,7 @@ function user_profile_form($form_state, 
     );
   }
 
+  $form['#validate'][] = 'user_profile_form_validate';
   return $form;
 }