diff --git a/contrib/pm/main.php b/contrib/pm/main.php
index c7ef0092..563efdd2 100644
--- a/contrib/pm/main.php
+++ b/contrib/pm/main.php
@@ -112,7 +112,7 @@ class PrivMsg extends Extension {
 						}
 						else if(($pm["to_id"] == $user->id) || $user->is_admin()) {
 							$from_user = User::by_id(int_escape($pm["from_id"]));
-							$database->get_row("UPDATE private_message SET is_read='Y' WHERE id = :id", array("id" => $pm_id));
+							$database->execute("UPDATE private_message SET is_read='Y' WHERE id = :id", array("id" => $pm_id));
 							$database->cache->delete("pm-count-{$user->id}");
 							$this->theme->display_message($page, $from_user, $user, new PM($pm));
 						}