diff --git a/modules/comment.module b/modules/comment.module
index 19fb00ac431..755eff9ad69 100644
--- a/modules/comment.module
+++ b/modules/comment.module
@@ -1588,10 +1588,10 @@ function theme_comment_post_forbidden($nid) {
     }
 
     if (variable_get('user_register', 1)) {
-      return t('<a href="%login">login</a> or <a href="%register">register</a> to post comments', array('%login' => url('user/login', $destination), '%register' => url('user/register', $destination)));
+      return t('<a href="%login">login</a> or <a href="%register">register</a> to post comments', array('%login' => url('user/login', $destination), '%register' => check_url(url('user/register', $destination))));
     }
     else {
-      return t('<a href="%login">login</a> to post comments', array('%login' => url('user/login', $destination)));
+      return t('<a href="%login">login</a> to post comments', array('%login' => check_url(url('user/login', $destination))));
     }
   }
 }
diff --git a/modules/comment/comment.module b/modules/comment/comment.module
index 19fb00ac431..755eff9ad69 100644
--- a/modules/comment/comment.module
+++ b/modules/comment/comment.module
@@ -1588,10 +1588,10 @@ function theme_comment_post_forbidden($nid) {
     }
 
     if (variable_get('user_register', 1)) {
-      return t('<a href="%login">login</a> or <a href="%register">register</a> to post comments', array('%login' => url('user/login', $destination), '%register' => url('user/register', $destination)));
+      return t('<a href="%login">login</a> or <a href="%register">register</a> to post comments', array('%login' => url('user/login', $destination), '%register' => check_url(url('user/register', $destination))));
     }
     else {
-      return t('<a href="%login">login</a> to post comments', array('%login' => url('user/login', $destination)));
+      return t('<a href="%login">login</a> to post comments', array('%login' => check_url(url('user/login', $destination))));
     }
   }
 }