diff --git a/tests/regression/test_fieldsplit_fieldsplit_aux_multigrid.py b/tests/regression/test_fieldsplit_fieldsplit_aux_multigrid.py
index c433b4c355..8684c30617 100644
--- a/tests/regression/test_fieldsplit_fieldsplit_aux_multigrid.py
+++ b/tests/regression/test_fieldsplit_fieldsplit_aux_multigrid.py
@@ -91,6 +91,7 @@ def alpha(d):
                            "mat_type": "aij",
                            "pc_type": "lu",
                            "pc_factor_mat_solver_type": "mumps",
+                           "mat_mumps_icntl_24": 1,
                            "snes_monitor": None}
     nsp_guess = MixedVectorSpaceBasis(G, [G.sub(0), VectorSpaceBasis(constant=True)])
     solve(F_guess == 0, g, bcs=Gbcs, nullspace=nsp_guess, solver_parameters=solver_params_guess)