diff --git a/teapot.py b/teapot.py
index d7ef8c3..1ba5d59 100644
--- a/teapot.py
+++ b/teapot.py
@@ -1,6 +1,7 @@
 #!/usr/bin/env python3
 import asyncio
 import configparser
+from configparser import ExtendedInterpolation
 import csv
 import datetime
 import errno
@@ -28,7 +29,7 @@
 from starlette.background import BackgroundTask
 from starlette.responses import StreamingResponse
 
-config = configparser.ConfigParser()
+config = configparser.ConfigParser(interpolation=ExtendedInterpolation())
 config.read("/etc/teapot/config.ini")