diff --git a/source/simulator/assemblers/newton_stokes.cc b/source/simulator/assemblers/newton_stokes.cc
index 8beeb1c34c2..3ead6051277 100644
--- a/source/simulator/assemblers/newton_stokes.cc
+++ b/source/simulator/assemblers/newton_stokes.cc
@@ -152,8 +152,8 @@ namespace aspect
                       if (scratch.dof_component_indices[i] ==
                           scratch.dof_component_indices[j])
                         {
-                          data.local_matrix(i, j) += ((2.0 * eta * alpha * (scratch.grads_phi_u[i] * scratch.grads_phi_u[j]))
-                                                      + derivative_scaling_factor * alpha * (scratch.grads_phi_u[i] * (viscosity_derivative_wrt_strain_rate * scratch.grads_phi_u[j]) * strain_rate)
+                          data.local_matrix(i, j) += ((2.0 * eta * (scratch.grads_phi_u[i] * scratch.grads_phi_u[j]))
+                                                      + derivative_scaling_factor * alpha * 2.0 * (scratch.grads_phi_u[i] * (viscosity_derivative_wrt_strain_rate * scratch.grads_phi_u[j]) * strain_rate)
                                                       + one_over_eta * this->get_pressure_scaling()
                                                       * this->get_pressure_scaling()
                                                       * (scratch.phi_p[i] * scratch
@@ -335,7 +335,7 @@ namespace aspect
                       for (unsigned int i=0; i<stokes_dofs_per_cell; ++i)
                         for (unsigned int j=0; j<stokes_dofs_per_cell; ++j)
                           {
-                            data.local_matrix(i,j) += ( derivative_scaling_factor * alpha * (scratch.grads_phi_u[i] * (viscosity_derivative_wrt_strain_rate * scratch.grads_phi_u[j]) * strain_rate)
+                            data.local_matrix(i,j) += ( derivative_scaling_factor * alpha * 2.0 * (scratch.grads_phi_u[i] * (viscosity_derivative_wrt_strain_rate * scratch.grads_phi_u[j]) * strain_rate)
                                                         + derivative_scaling_factor * this->get_pressure_scaling() * scratch.grads_phi_u[i] * 2.0 * viscosity_derivative_wrt_pressure * scratch.phi_p[j] * strain_rate )
                                                       * JxW;
 
diff --git a/source/simulator/parameters.cc b/source/simulator/parameters.cc
index 3ed15ffbc72..144d0518874 100644
--- a/source/simulator/parameters.cc
+++ b/source/simulator/parameters.cc
@@ -1057,8 +1057,8 @@ namespace aspect
         use_Newton_stabilisation_A_block = prm.get("Use Newton stabilization A block");
         use_Newton_failsafe = prm.get_bool("Use Newton failsafe");
 
-        AssertThrow(!DEAL_II_VERSION_GTE(9,0,0) && !use_Newton_failsafe, ExcMessage("The failsafe option can't be used with a deal.ii "
-                                                                                    " les then 9.0.0."));
+//        AssertThrow(!DEAL_II_VERSION_GTE(9,0,0) && !use_Newton_failsafe, ExcMessage("The failsafe option can't be used with a deal.ii "
+//                                                                                    " les then 9.0.0."));
       }
       prm.leave_subsection ();
       prm.enter_subsection ("AMG parameters");