diff --git a/root/usr/local/etc/php/conf.d/dokuwiki.ini b/root/usr/local/etc/php/conf.d/dokuwiki.ini
index c0a87bf..919c98a 100644
--- a/root/usr/local/etc/php/conf.d/dokuwiki.ini
+++ b/root/usr/local/etc/php/conf.d/dokuwiki.ini
@@ -3,3 +3,4 @@ post_max_size = ${PHP_UPLOADLIMIT}
 upload_max_filesize = ${PHP_UPLOADLIMIT}
 memory_limit = ${PHP_MEMORYLIMIT}
 date.timezone = ${PHP_TIMEZONE}
+auto_prepend_file = /var/www/html/.autoprepend.php
diff --git a/root/var/www/html/.autoprepend.php b/root/var/www/html/.autoprepend.php
new file mode 100644
index 0000000..516a90e
--- /dev/null
+++ b/root/var/www/html/.autoprepend.php
@@ -0,0 +1,7 @@
+<?php
+/**
+ * This file is automatically loaded by PHP before any other code. This ensures that DOKU_INC is
+ * is always pointing to the correct location within the container, even when the entry point is
+ * a plugin.
+ */
+if (!defined('DOKU_INC')) define('DOKU_INC', __DIR__ . '/');
diff --git a/root/var/www/html/health.php b/root/var/www/html/health.php
index 3e749d4..d757d94 100644
--- a/root/var/www/html/health.php
+++ b/root/var/www/html/health.php
@@ -1,7 +1,7 @@
 <?php
 
 define('DOKU_UNITTEST', 1);
-define('DOKU_INC', __DIR__ . '/');
+if(!defined('DOKU_INC')) define('DOKU_INC', __DIR__ . '/');
 
 header('Content-Type: text/plain; charset=utf-8');
 try {