diff --git a/imageroot/bin/expand-configuration b/imageroot/bin/expand-configuration
index 59ef8b4..928d3ec 100755
--- a/imageroot/bin/expand-configuration
+++ b/imageroot/bin/expand-configuration
@@ -37,6 +37,7 @@ if os.environ.get("MAIL_SERVER", ''):
 properties = {
     "host":  os.environ["TRAEFIK_HOST"],
     "provider_ip": os.environ["PROVIDER_IP"],
+    "retention_days": os.environ.get("RETENTION_DAYS", 2557),
 }
 
 json_properties = json.dumps(properties)
diff --git a/imageroot/templates/piler.conf b/imageroot/templates/piler.conf
index 84e4c29..37f0618 100644
--- a/imageroot/templates/piler.conf
+++ b/imageroot/templates/piler.conf
@@ -4,7 +4,7 @@ backlog=20
 check_for_client_timeout_interval=20
 cipher_list=ECDH+AESGCM:DH+AESGCM:ECDH+AES256:DH+AES256:ECDH+AES128:DH+AES:ECDH+3DES:DH+3DES:RSA+AESGCM:RSA+AES:RSA+3DES:!aNULL:!MD5:!DSS
 clamd_socket=/tmp/clamd
-default_retention_days=2557
+default_retention_days={{retention_days}}
 enable_chunking=0
 enable_cjk=0
 enable_folders=0