diff --git a/README.mkd b/README.mkd
index bde5153..0f2c354 100644
--- a/README.mkd
+++ b/README.mkd
@@ -11,6 +11,11 @@ Fork notes
 - Use "... tables all" for all route queries
 - Python3 compatibility!
 
+Environment variables
+---------------------
+
+LG_CONFIG_FILE / LGPROXY_CONFIG_FILE: set the corresponding config file to use.
+
 Overview
 --------
 
diff --git a/lg.py b/lg.py
index 274918f..d93cb77 100644
--- a/lg.py
+++ b/lg.py
@@ -28,6 +28,7 @@
 import subprocess
 import logging
 from logging.handlers import TimedRotatingFileHandler
+import os
 import re
 from urllib.error import HTTPError
 from urllib.request import urlopen
@@ -49,7 +50,8 @@
 re_pat_time = re.compile("([0-9]{2}:[0-9]{2}(:[0-9]{2})?)")
 
 app = Flask(__name__)
-app.config.from_pyfile("lg.cfg")
+config_file = os.environ.get("LG_CONFIG_FILE", "lg.cfg")
+app.config.from_pyfile(config_file)
 app.secret_key = app.config["SESSION_KEY"]
 app.debug = app.config["DEBUG"]
 
@@ -537,7 +539,7 @@ def build_as_tree_from_raw_bird_ouput(text: list[str]):
     # remove unparsed BGP attributes.
     # string comparisons are cheaper than regex.
     text = [line.strip() for line in text]
-    text = [line for line in text if not (line.startswith("BGP.") and line[4] != "a") ]
+    text = [line for line in text if not (line.startswith("BGP.") and line[4] != "a")]
     # No idea how I could clean this up, pylint complains...
     for line in text:
         # bird1: cli_printf(c, -1008, "\tType: %s %s %s", src_names[a->source], \
diff --git a/lgproxy.py b/lgproxy.py
index d0408eb..7c28216 100644
--- a/lgproxy.py
+++ b/lgproxy.py
@@ -25,7 +25,7 @@
 
 """HTTP proxy for BIRD socket."""
 
-
+import os
 import logging
 from logging.handlers import TimedRotatingFileHandler
 from urllib.parse import unquote
@@ -37,8 +37,9 @@
 from bird import BirdSocket
 
 app = Flask(__name__)
+config_file = os.environ.get("LGPROXY_CONFIG_FILE", "lgproxy.cfg")
+app.config.from_pyfile(config_file)
 app.debug = app.config["DEBUG"]
-app.config.from_pyfile("lgproxy.cfg")
 
 file_handler = TimedRotatingFileHandler(
     filename=app.config["LOG_FILE"],