diff --git a/lofar_station_client/observation/observation.py b/lofar_station_client/observation/observation.py
index 7e200ce92e9f95bc9270a9da2c9c24daa49bc736..4e8ff48f1d39cb8969b1d0681f6c06c33b3c9b71 100644
--- a/lofar_station_client/observation/observation.py
+++ b/lofar_station_client/observation/observation.py
@@ -24,10 +24,10 @@ class Observation:
     """
 
     def __init__(
-            self,
-            specification: dict,
-            host: str = "databaseds.tangonet:10000",
-            station="STAT", 
+        self,
+        specification: dict,
+        host: str = "databaseds.tangonet:10000",
+        station="STAT",
     ):
 
         # create device proxies to station at "host"