diff --git a/fem/tests/HelmholtzFEM/HelmholtzFEM.sif b/fem/tests/HelmholtzFEM/HelmholtzFEM.sif
index 8d465a5d25..2a8be7efb1 100644
--- a/fem/tests/HelmholtzFEM/HelmholtzFEM.sif
+++ b/fem/tests/HelmholtzFEM/HelmholtzFEM.sif
@@ -56,7 +56,7 @@ Solver 1
   Linear System Max Iterations = 300
   Linear System Convergence Tolerance = 1.0e-08
   Linear System Abort Not Converged = True
-  Linear System Preconditioning = "ILU2"
+  Linear System Preconditioning = vanka !"ILU2"
   Linear System Residual Output = 1
   Linear System Precondition Recompute = 1
   Linear System Preconditioning Damp Coefficient Im = 1.0