diff --git a/docker-compose.yml b/docker-compose.yml
index cacf904..128a250 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -30,6 +30,7 @@ services:
       DEFAULT_LAT: 0
       DEFAULT_LON: 0
       DEFAULT_LANGUAGE: en
+      IMPRESSUM_URL: https://hamburg.ccc.de/imprint/
     ports:
       - "8080:80"
     depends_on:
diff --git a/web/www/sunders/config.php b/web/www/sunders/config.php
index c874eca..3050d6c 100644
--- a/web/www/sunders/config.php
+++ b/web/www/sunders/config.php
@@ -5,6 +5,7 @@
     define('DEFAULT_LANGUAGE', getenv('DEFAULT_LANGUAGE') ?: 'en');
     define('DEFAULT_PIE', 'country');
     define('DEFAULT_TIME', 'single');
+    define('IMPRESSUM_URL', getenv('IMPRESSUM_URL') ?: '');
 
     define('MYSQL_HOST', getenv('MYSQL_HOST') ?: '');
     define('MYSQL_DB', getenv('MYSQL_DB') ?: '');
diff --git a/web/www/sunders/index.php b/web/www/sunders/index.php
index af57316..81932de 100644
--- a/web/www/sunders/index.php
+++ b/web/www/sunders/index.php
@@ -237,7 +237,7 @@
         <br><br>
         &#x2756;
         <br><br><br>
-        <a href="https://hamburg.ccc.de/imprint/">Impressum</a>
+        <a href="<?php echo IMPRESSUM_URL?>">Impressum</a>
         <br><br>
         <?php echo translate($i18nCommon, $i18nCommonDefault, 'gdpr', [], [], []); ?>
         <br><br>