diff --git a/include/functions.php b/include/functions.php
index a22e1d379..8739af052 100644
--- a/include/functions.php
+++ b/include/functions.php
@@ -1108,8 +1108,8 @@
 			"P" => "article_page_up",
 			"*(33)|Shift+PgUp" => "article_page_up",
 			"*(34)|Shift+PgDn" => "article_page_down",
-			//"(38)|Up" => "prev_article_or_scroll",
-			//"(40)|Down" => "next_article_or_scroll",
+			"(38)|Up" => "prev_article_or_scroll",
+			"(40)|Down" => "next_article_or_scroll",
 			"*(38)|Shift+Up" => "article_scroll_up",
 			"*(40)|Shift+Down" => "article_scroll_down",
 			"^(38)|Ctrl+Up" => "prev_article_noscroll",