diff --git a/weather_to_freemobile.py b/weather_to_freemobile.py
index db4604c..0750e62 100755
--- a/weather_to_freemobile.py
+++ b/weather_to_freemobile.py
@@ -4,14 +4,16 @@ A simple script that sends the daily weather to a FreeMobile phone
 """
 import json
 import logging
+import os
 import pyowm
 import requests
+import sys
 
 class WeatherToFreemobile():
-    def __init__(self, config_file='config.json'):
-        logging.info('Load configuration from config.json file')
-        with open('config.json') as config_file:
-            self.config = json.load(config_file)
+    def __init__(self, config_file):
+        logging.info('Load configuration from {}'.format(config_file))
+        with open(config_file) as configuration:
+            self.config = json.load(configuration)
              
     def send_sms_to_freemobile(self, message):
         """
@@ -60,5 +62,12 @@ class WeatherToFreemobile():
     
 if __name__ == "__main__":
     logging.basicConfig(level=logging.DEBUG, format=' %(asctime)s - %(levelname)s - %(message)s')
-    wtf = WeatherToFreemobile()
+    if len(sys.argv) > 1:
+        wtf = WeatherToFreemobile(sys.argv[1])
+    else:
+        config_file = os.path.join(
+            os.path.dirname(os.path.realpath(sys.argv[0])),
+            'config.json'
+        )
+        wtf = WeatherToFreemobile(config_file)
     wtf.send_sms_to_freemobile(wtf.get_weather())