diff --git a/DDCore/python/dd4hep_base.py b/DDCore/python/dd4hep_base.py
index 5f95ba1804988fb633ff618a4a1814be4ae41200..b3f843380617dd70c219ea45aec1ed0e3bd465d9 100644
--- a/DDCore/python/dd4hep_base.py
+++ b/DDCore/python/dd4hep_base.py
@@ -411,6 +411,7 @@ class CommandLine:
       return self.data.get(attr)
     return None
 
+
 # ---------------------------------------------------------------------------
 #
 #  Import units from TGeo.
@@ -419,7 +420,6 @@ class CommandLine:
 try:
   import_namespace_item('core', 'dd4hep_units')
 
-
   def import_units(ns=None):
     if ns is None:
       ns = name_space
@@ -436,7 +436,6 @@ try:
 except Exception as e:
   logger.warning('No units can be imported. ' + str(e))
 
-
   def import_units(ns=None):
     return 0