diff --git a/Tests/Data/Mechanics/HoekBrown/load_test_hb_nonassociated.prj b/Tests/Data/Mechanics/HoekBrown/load_test_hb_nonassociated.prj
index 8ba7f0825c5bc3e509116bc21417bc77ebe885bc..7b451e44d41f055e0ad3e779115155e267abbacc 100644
--- a/Tests/Data/Mechanics/HoekBrown/load_test_hb_nonassociated.prj
+++ b/Tests/Data/Mechanics/HoekBrown/load_test_hb_nonassociated.prj
@@ -266,6 +266,9 @@
                 <solver_type>SparseLU</solver_type>
                 <scaling>true</scaling>
             </eigen>
+            <petsc>
+                <parameters>-ksp_type bcgs -pc_type bjacobi -ksp_rtol 1e-15 -ksp_atol 1e-16 -ksp_max_it 4000</parameters>
+            </petsc>
         </linear_solver>
     </linear_solvers>
     <test_definition>
diff --git a/Tests/Data/Mechanics/MohrCoulombAbboSloan/slope.prj b/Tests/Data/Mechanics/MohrCoulombAbboSloan/slope.prj
index 41cc5ff58db295ffee4e0e4a5992a08e03f5ba81..92e4e57c3e340f464c69cd86d97968fd05930621 100644
--- a/Tests/Data/Mechanics/MohrCoulombAbboSloan/slope.prj
+++ b/Tests/Data/Mechanics/MohrCoulombAbboSloan/slope.prj
@@ -272,6 +272,9 @@
                 <solver_type>SparseLU</solver_type>
                 <scaling>true</scaling>
             </eigen>
+            <petsc>
+                <parameters>-ksp_type bcgs -pc_type bjacobi -ksp_rtol 1e-15 -ksp_atol 1e-16 -ksp_max_it 4000</parameters>
+            </petsc>
         </linear_solver>
     </linear_solvers>
     <test_definition>