diff --git a/wp-includes/nav-menu.php b/wp-includes/nav-menu.php
index 0d6dd3224..d65e3a3e6 100644
--- a/wp-includes/nav-menu.php
+++ b/wp-includes/nav-menu.php
@@ -78,6 +78,23 @@ function register_nav_menus( $locations = array() ) {
 	$_wp_registered_nav_menus = array_merge( (array) $_wp_registered_nav_menus, $locations );
 }
 
+/**
+ * Unregisters a navigation menu for a theme.
+ *
+ * @param array $location the menu location identifier
+ *
+ * @return bool True on success, false on failure.
+ */
+function unregister_nav_menu( $location ) {
+	global $_wp_registered_nav_menus;
+
+	if ( is_array( $_wp_registered_nav_menus ) && isset( $_wp_registered_nav_menus[$location] ) ) {
+		unset( $_wp_registered_nav_menus[$location] );
+		return true;
+	}
+	return false;
+}
+
 /**
  * Register a navigation menu for a theme.
  *