diff --git a/xanthos/data_reader/ini_reader.py b/xanthos/data_reader/ini_reader.py
index 018fa563..7561cdf9 100644
--- a/xanthos/data_reader/ini_reader.py
+++ b/xanthos/data_reader/ini_reader.py
@@ -603,5 +603,5 @@ def update(self, args):
         """
         for k, v in args.items():
             if not hasattr(self, k):
-                print('Warning: {} is not a valid parameter'.format(k))
+                logging.warning('{} is not a valid parameter'.format(k))
             setattr(self, k, v)