diff --git a/tests/firedrake/regression/test_adjoint_operators.py b/tests/firedrake/regression/test_adjoint_operators.py
index d0abec9a0b..8d4c0ab796 100644
--- a/tests/firedrake/regression/test_adjoint_operators.py
+++ b/tests/firedrake/regression/test_adjoint_operators.py
@@ -1002,6 +1002,7 @@ def test_cofunction_assign_functional():
     f.assign(2.0)
     assert np.allclose(Jhat(f), 2.0)
 
+
 @pytest.mark.skipcomplex  # Taping for complex-valued 0-forms not yet done
 def test_bdy_control():
     # Test for the case the boundary condition is a control for a