diff --git a/test/test_grudge.py b/test/test_grudge.py
index 46508008200e0bda06bd8725ada8bc31c0e40740..c41f4e6eecc56700797ad43c8b425cceac289879 100644
--- a/test/test_grudge.py
+++ b/test/test_grudge.py
@@ -933,7 +933,7 @@ def test_improvement_quadrature(actx_factory, order):
             nodes = thaw(actx, op.nodes(dcoll))
 
             def zero_inflow(dtag, t=0):
-                dd = dof_desc.DOFDesc(BTAG_ALL, qtag)
+                dd = dof_desc.DOFDesc(dtag, qtag)
                 return dcoll.discr_from_dd(dd).zeros(actx)
 
             adv_op = VariableCoefficientAdvectionOperator(