diff --git a/tasks/phpstan/bootstrap.php b/tasks/phpstan/bootstrap.php
index 93a7fdd099..71e7bb2026 100644
--- a/tasks/phpstan/bootstrap.php
+++ b/tasks/phpstan/bootstrap.php
@@ -1,6 +1,25 @@
 <?php
 
+// Constants
 define('ABSPATH', getenv('WP_ROOT') . '/');
-
+define('WPINC', 'wp-includes');
+define('WP_DEBUG', false);
+define('WP_LANG_DIR', 'wp-content/languages');
+define('WP_PLUGIN_DIR', 'wp-content/plugins');
+define('WP_MEMORY_LIMIT', 268435456);
+define('WP_MAX_MEMORY_LIMIT', 268435456);
+define('ARRAY_A', 'ARRAY_A');
+define('OBJECT', 'OBJECT');
+define('MINUTE_IN_SECONDS', 60);
+define('HOUR_IN_SECONDS', 60 * MINUTE_IN_SECONDS);
+define('DAY_IN_SECONDS', 24 * HOUR_IN_SECONDS);
+define('WEEK_IN_SECONDS', 7 * DAY_IN_SECONDS);
+define('MONTH_IN_SECONDS', 30 * DAY_IN_SECONDS);
+define('YEAR_IN_SECONDS', 365 * DAY_IN_SECONDS);
+define('MAILPOET_VERSION', '1.0.0');
+
+// Define Database Tables constants
+$dbConfig = new \MailPoet\Config\Database();
+$dbConfig->defineTables();