diff --git a/wp-includes/functions.php b/wp-includes/functions.php
index 0a4f49206..bed84abb6 100644
--- a/wp-includes/functions.php
+++ b/wp-includes/functions.php
@@ -3501,6 +3501,18 @@ function __return_empty_array() {
 	return array();
 }
 
+/**
+ * Returns null.
+ *
+ * Useful for returning null to filters easily.
+ *
+ * @since 3.3.0
+ * @return null
+ */
+function __return_null() {
+	return null;
+}
+
 /**
  * Send a HTTP header to disable content type sniffing in browsers which support it.
  *