Index: captcha.module
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/captcha/captcha.module,v
retrieving revision 1.103.2.12
diff -u -b -u -p -r1.103.2.12 captcha.module
--- captcha.module	31 Oct 2010 10:01:50 -0000	1.103.2.12
+++ captcha.module	2 Nov 2010 22:15:25 -0000
@@ -591,7 +591,9 @@ function captcha_validate($element, &$fo
       // captcha_validate(), does not check error conditions of extra form
       // elements like the CAPTCHA.
       if ($form_id == 'user_login' || $form_id == 'user_login_block') {
-        drupal_goto($_GET['q']);
+        $destination =  drupal_get_destination();
+        unset($_REQUEST['destination']);
+        drupal_goto($_GET['q'], $destination);
       }
     }
   }