diff --git a/classes/api.php b/classes/api.php
index ad0372dbf..8ffa74d9e 100644
--- a/classes/api.php
+++ b/classes/api.php
@@ -297,7 +297,7 @@ class API extends Handler {
 			$num_updated = $sth->rowCount();
 
 			if ($num_updated > 0 && $field == "unread") {
-				$sth = $this->pdo->query("SELECT DISTINCT feed_id FROM ttrss_user_entries
+				$sth = $this->pdo->prepare("SELECT DISTINCT feed_id FROM ttrss_user_entries
 					WHERE ref_id IN ($article_qmarks)");
 				$sth->execute($article_ids);