diff --git a/src/wp-includes/functions.php b/src/wp-includes/functions.php
index 3ac199e1f0..6102da94f2 100644
--- a/src/wp-includes/functions.php
+++ b/src/wp-includes/functions.php
@@ -4923,8 +4923,8 @@ function _deprecated_argument( $function, $version, $message = null ) {
  *
  * @param string $hook        The hook that was used.
  * @param string $version     The version of WordPress that deprecated the hook.
- * @param string $replacement Optional. The hook that should have been used.
- * @param string $message     Optional. A message regarding the change.
+ * @param string $replacement Optional. The hook that should have been used. Default null.
+ * @param string $message     Optional. A message regarding the change. Default null.
  */
 function _deprecated_hook( $hook, $version, $replacement = null, $message = null ) {
 	/**
diff --git a/src/wp-includes/plugin.php b/src/wp-includes/plugin.php
index 97a1ffd588..66d2379655 100644
--- a/src/wp-includes/plugin.php
+++ b/src/wp-includes/plugin.php
@@ -620,10 +620,10 @@ function remove_all_actions( $tag, $priority = false ) {
  * @param string $tag         The name of the filter hook.
  * @param array  $args        Array of additional function arguments to be passed to apply_filters().
  * @param string $version     The version of WordPress that deprecated the hook.
- * @param string $replacement Optional. The hook that should have been used. Default false.
+ * @param string $replacement Optional. The hook that should have been used. Default null.
  * @param string $message     Optional. A message regarding the change. Default null.
  */
-function apply_filters_deprecated( $tag, $args, $version, $replacement = false, $message = null ) {
+function apply_filters_deprecated( $tag, $args, $version, $replacement = null, $message = null ) {
 	if ( ! has_filter( $tag ) ) {
 		return $args[0];
 	}
@@ -647,10 +647,10 @@ function apply_filters_deprecated( $tag, $args, $version, $replacement = false,
  * @param string $tag         The name of the action hook.
  * @param array  $args        Array of additional function arguments to be passed to do_action().
  * @param string $version     The version of WordPress that deprecated the hook.
- * @param string $replacement Optional. The hook that should have been used.
- * @param string $message     Optional. A message regarding the change.
+ * @param string $replacement Optional. The hook that should have been used. Default null.
+ * @param string $message     Optional. A message regarding the change. Default null.
  */
-function do_action_deprecated( $tag, $args, $version, $replacement = false, $message = null ) {
+function do_action_deprecated( $tag, $args, $version, $replacement = null, $message = null ) {
 	if ( ! has_action( $tag ) ) {
 		return;
 	}