diff --git a/ext/comment/main.php b/ext/comment/main.php
index 3f889cd6..0c364d57 100644
--- a/ext/comment/main.php
+++ b/ext/comment/main.php
@@ -374,9 +374,10 @@ class CommentList extends SimpleExtension {
 		$window = int_escape($config->get_int('comment_window'));
 		$max = int_escape($config->get_int('comment_limit'));
 
+		// window doesn't work as an SQL param because it's inside quotes >_<
 		$result = $database->get_all("SELECT * FROM comments WHERE owner_ip = :remote_ip ".
-				"AND posted > date_sub(now(), interval :window minute)",
-				Array("remote_ip"=>$_SERVER['REMOTE_ADDR'], "window"=>$window));
+				"AND posted > now() - interval '$window minute'",
+				Array("remote_ip"=>$_SERVER['REMOTE_ADDR']));
 
 		return (count($result) >= $max);
 	}