diff --git a/python/dune/perftool/sumfact/accumulation.py b/python/dune/perftool/sumfact/accumulation.py
index 111829257019b079dfc2af0aa5d454be9b9eae26..fa48689f1034952acf21fcab15ca88775d24ea8f 100644
--- a/python/dune/perftool/sumfact/accumulation.py
+++ b/python/dune/perftool/sumfact/accumulation.py
@@ -136,6 +136,7 @@ def get_accumulation_info(expr, visitor):
                                    grad_index=grad_index,
                                    )
 
+
 def _get_childs(element):
     from ufl import FiniteElement
     if isinstance(element, FiniteElement):