diff --git a/db-prefs.php b/db-prefs.php
index 1c9bbd116..15f03c094 100644
--- a/db-prefs.php
+++ b/db-prefs.php
@@ -77,7 +77,7 @@
 		}
 	}
 
-	function set_pref($link, $key, $value, $user_id) {
+	function set_pref($link, $key, $value, $user_id = false) {
 		$key = db_escape_string($key);
 		$value = db_escape_string($value);