diff --git a/python/dune/perftool/pdelab/function.py b/python/dune/perftool/pdelab/function.py
index d5949988d811f7abcc5dbfbdcda88bb387f6505d..564b44479eb1c706d740e4f5e0867d57ef71c7c7 100644
--- a/python/dune/perftool/pdelab/function.py
+++ b/python/dune/perftool/pdelab/function.py
@@ -37,6 +37,7 @@ def declare_grid_function_range(gridfunction):
 
     return _decl
 
+
 @kernel_cached
 def pymbolic_evaluate_gridfunction(name, coeff, restriction, grad):
     diffOrder = 1 if grad else 0