diff --git a/dsmr_parser/value_types.py b/dsmr_parser/value_types.py
index f915918..faf10b9 100644
--- a/dsmr_parser/value_types.py
+++ b/dsmr_parser/value_types.py
@@ -6,6 +6,7 @@ import pytz
 # Preload timezone to avoid loading in event loop later
 local_tz = pytz.timezone('Europe/Amsterdam')
 
+
 def timestamp(value):
     try:
         naive_datetime = datetime.datetime.strptime(value[:-1], '%y%m%d%H%M%S')