diff --git a/app/layout/nav_menu.phtml b/app/layout/nav_menu.phtml
index 095b0a787..594913935 100644
--- a/app/layout/nav_menu.phtml
+++ b/app/layout/nav_menu.phtml
@@ -132,7 +132,7 @@
 		);
 
 		$mark_unread_url = $mark_read_url;
-		$mark_unread_url['params']['is_read'] = false;
+		$mark_unread_url['params']['is_read'] = '0';
 		$mark_unread_url['params']['nextGet'] = $get;
 	?>