diff --git src/wp-includes/shortcodes.php src/wp-includes/shortcodes.php
index 538b6e79da..8782641894 100644
--- src/wp-includes/shortcodes.php
+++ src/wp-includes/shortcodes.php
@@ -30,17 +30,6 @@
  * @since 2.5.0
  */
 
-/**
- * Container for storing shortcode tags and their hook to call for the shortcode.
- *
- * @since 2.5.0
- *
- * @name $shortcode_tags
- * @var array
- * @global array $shortcode_tags
- */
-$shortcode_tags = array();
-
 /**
  * Adds a new shortcode.
  *