diff --git a/src/wp-includes/widgets.php b/src/wp-includes/widgets.php
index fab278c920..93d875b69d 100644
--- a/src/wp-includes/widgets.php
+++ b/src/wp-includes/widgets.php
@@ -782,13 +782,13 @@ function dynamic_sidebar( $index = 1 ) {
  *
  * @global array $wp_registered_widgets
  *
- * @param string $callback      Optional, Widget callback to check.
- * @param int    $widget_id     Optional, but needed for checking. Widget ID.
- * @param string $id_base       Optional, the base ID of a widget created by extending WP_Widget.
- * @param bool   $skip_inactive Optional, whether to check in 'wp_inactive_widgets'.
+ * @param string|false $callback      Optional, Widget callback to check. Default false.
+ * @param int|false    $widget_id     Optional. Widget ID. Optional, but needed for checking. Default false.
+ * @param string|false $id_base       Optional. The base ID of a widget created by extending WP_Widget. Default false.
+ * @param bool         $skip_inactive Optional. Whether to check in 'wp_inactive_widgets'. Default true.
  * @return string|false False if widget is not active or id of sidebar in which the widget is active.
  */
-function is_active_widget($callback = false, $widget_id = false, $id_base = false, $skip_inactive = true) {
+function is_active_widget( $callback = false, $widget_id = false, $id_base = false, $skip_inactive = true ) {
 	global $wp_registered_widgets;
 
 	$sidebars_widgets = wp_get_sidebars_widgets();