diff --git a/coder_sniffer/Drupal/Sniffs/NamingConventions/ValidGlobalSniff.php b/coder_sniffer/Drupal/Sniffs/NamingConventions/ValidGlobalSniff.php
index 548dde0..3bfebd9 100644
--- a/coder_sniffer/Drupal/Sniffs/NamingConventions/ValidGlobalSniff.php
+++ b/coder_sniffer/Drupal/Sniffs/NamingConventions/ValidGlobalSniff.php
@@ -30,6 +30,7 @@ class Drupal_Sniffs_NamingConventions_ValidGlobalSniff implements PHP_CodeSniffe
                            '$base_url',
                            '$channel',
                            '$conf',
+                           '$config_directories',
                            '$cookie_domain',
                            '$databases',
                            '$db_prefix',