diff --git a/Documentation/ProjectFile/prj/processes/process/HYDRO_MECHANICS/initial_stress/i_initial_stress.md b/Documentation/ProjectFile/prj/processes/process/HYDRO_MECHANICS/initial_stress/i_initial_stress.md
index 872e328bd43..d9828fd553e 100644
--- a/Documentation/ProjectFile/prj/processes/process/HYDRO_MECHANICS/initial_stress/i_initial_stress.md
+++ b/Documentation/ProjectFile/prj/processes/process/HYDRO_MECHANICS/initial_stress/i_initial_stress.md
@@ -1,3 +1,3 @@
-A optional tag to input the parameter of initial stress in porous media. It is
+An optional tag to input the parameter of initial stress in porous media. It is
  used in processes `LIE`, `HydroMechanics`, `ThermoHydroMechanics`,
  `RichardsMechanics`, `ThermoRichardsMechanics`, and `TH2M`.
diff --git a/Documentation/ProjectFile/prj/processes/process/initial_stress/i_initial_stress.md b/Documentation/ProjectFile/prj/processes/process/initial_stress/i_initial_stress.md
index 872e328bd43..d9828fd553e 100644
--- a/Documentation/ProjectFile/prj/processes/process/initial_stress/i_initial_stress.md
+++ b/Documentation/ProjectFile/prj/processes/process/initial_stress/i_initial_stress.md
@@ -1,3 +1,3 @@
-A optional tag to input the parameter of initial stress in porous media. It is
+An optional tag to input the parameter of initial stress in porous media. It is
  used in processes `LIE`, `HydroMechanics`, `ThermoHydroMechanics`,
  `RichardsMechanics`, `ThermoRichardsMechanics`, and `TH2M`.
diff --git a/ProcessLib/HydroMechanics/HydroMechanicsFEM-impl.h b/ProcessLib/HydroMechanics/HydroMechanicsFEM-impl.h
index 6960e1ccde2..46a681961fe 100644
--- a/ProcessLib/HydroMechanics/HydroMechanicsFEM-impl.h
+++ b/ProcessLib/HydroMechanics/HydroMechanicsFEM-impl.h
@@ -884,8 +884,8 @@ void HydroMechanicsLocalAssembler<ShapeFunctionDisplacement,
                         .template value<double>(vars, x_position, t, dt);
 
                 auto& sigma_eff = _ip_data[ip].sigma_eff;
-                sigma_eff += alpha_b * N_p.dot(p) * identity2;
-                _ip_data[ip].sigma_eff_prev = sigma_eff;
+                sigma_eff.noalias() += alpha_b * N_p.dot(p) * identity2;
+                _ip_data[ip].sigma_eff_prev.noalias() = sigma_eff;
             }
         }
     }