diff --git a/wordpress/wp-config.php b/wordpress/wp-config.php
index a73b714..e9ac4a7 100644
--- a/wordpress/wp-config.php
+++ b/wordpress/wp-config.php
@@ -19,3 +19,8 @@
     $_SERVER['HTTPS'] = 'on';
     $_SERVER['SERVER_PORT'] = 443;
 }
+
+// Set varnish cache ip for purge plugin
+if (getenv('VARNISH_SVC_SERVICE_HOST')) {
+    define('VHP_VARNISH_IP', getenv('VARNISH_SVC_SERVICE_HOST'));
+}