diff --git wysiwyg_filter.admin.inc wysiwyg_filter.admin.inc
index 7726076..decf2ca 100644
--- wysiwyg_filter.admin.inc
+++ wysiwyg_filter.admin.inc
@@ -241,13 +241,6 @@ function wysiwyg_filter_settings_filter_validate($form, &$form_state) {
       form_set_error($field_name, implode('<br />', $errors));
     }
   }
-
-  $nofollow_domains = array_filter(explode(',', preg_replace('#\s+#', ',', $form_state['values']['wysiwyg_filter_nofollow_domains_'. $format])));
-  foreach ($nofollow_domains as $nofollow_domain) {
-    if (!preg_match('#^([a-z0-9]([-a-z0-9]*)?\.)+([a-z]+)$#i', $nofollow_domain)) {
-      form_set_error('wysiwyg_filter_nofollow_domains_'. $format, t('Invalid domain %domain. Please, enter a comma separated list of valid domain names.', array('%domain' => $nofollow_domain)));
-    }
-  }
 }
 
 /**