diff --git a/frappy_psi/haake.py b/frappy_psi/haake.py
index 5369154..7ddd336 100644
--- a/frappy_psi/haake.py
+++ b/frappy_psi/haake.py
@@ -22,6 +22,7 @@ from frappy.core import StringIO, HasIO, Parameter, FloatRange, BoolType, \
 from frappy_psi.convergence import HasConvergence
 from frappy.errors import CommunicationFailedError
 
+
 def convert(string):
     number = re.sub(r'[^0-9.-]', '', string)
     return float(number)