diff --git a/Tests/Data/Mechanics/Ehlers/MFront/cube_1e0_dp.prj b/Tests/Data/Mechanics/Ehlers/MFront/cube_1e0_dp.prj
index 23fdaf5bbe84dc3b50fc06d01dde012e854fff7b..936c3b4fbad43f6ce2affa1bf0feccb39afe8c05 100644
--- a/Tests/Data/Mechanics/Ehlers/MFront/cube_1e0_dp.prj
+++ b/Tests/Data/Mechanics/Ehlers/MFront/cube_1e0_dp.prj
@@ -37,6 +37,7 @@
                 <mp>mp</mp>
                 <betap>betap</betap>
                 <gammap>gammap</gammap>
+                <tangent_type>Plastic</tangent_type>
                 <nonlinear_solver>
                     <maximum_iterations>100</maximum_iterations>
                     <error_tolerance>1e-14</error_tolerance>
diff --git a/Tests/Data/Mechanics/Ehlers/axisymmetric_sphere_pl.prj b/Tests/Data/Mechanics/Ehlers/axisymmetric_sphere_pl.prj
index 88f4691a7ba486a35e0eec5e4cc0b17c750bd0bd..a939aeeba273274070a795044147eb3c132610a6 100644
--- a/Tests/Data/Mechanics/Ehlers/axisymmetric_sphere_pl.prj
+++ b/Tests/Data/Mechanics/Ehlers/axisymmetric_sphere_pl.prj
@@ -29,6 +29,7 @@
                 <mp>mp</mp>
                 <betap>betap</betap>
                 <gammap>gammap</gammap>
+                <tangent_type>Plastic</tangent_type>
                 <nonlinear_solver>
                     <maximum_iterations>1000</maximum_iterations>
                     <error_tolerance>1e-8</error_tolerance>
diff --git a/Tests/Data/Mechanics/Ehlers/cube_1e0.prj b/Tests/Data/Mechanics/Ehlers/cube_1e0.prj
index 03a631afe45f9a7008e5983522071807cd136c8d..bed2dc8872f21a9da1fdf75874ebe68b4bb096c0 100644
--- a/Tests/Data/Mechanics/Ehlers/cube_1e0.prj
+++ b/Tests/Data/Mechanics/Ehlers/cube_1e0.prj
@@ -25,6 +25,7 @@
                 <mp>mp</mp>
                 <betap>betap</betap>
                 <gammap>gammap</gammap>
+                <tangent_type>Plastic</tangent_type>
                 <nonlinear_solver>
                     <maximum_iterations>100</maximum_iterations>
                     <error_tolerance>1e-14</error_tolerance>
diff --git a/Tests/Data/Mechanics/Ehlers/cube_1e0_dp.prj b/Tests/Data/Mechanics/Ehlers/cube_1e0_dp.prj
index 75507a73f714600151c523aad71ade3e6d572e28..7e3f2526313d482ff5c16bce0923a33969f4b1d8 100644
--- a/Tests/Data/Mechanics/Ehlers/cube_1e0_dp.prj
+++ b/Tests/Data/Mechanics/Ehlers/cube_1e0_dp.prj
@@ -25,6 +25,7 @@
                 <mp>mp</mp>
                 <betap>betap</betap>
                 <gammap>gammap</gammap>
+                <tangent_type>Plastic</tangent_type>
                 <nonlinear_solver>
                     <maximum_iterations>100</maximum_iterations>
                     <error_tolerance>1e-14</error_tolerance>
diff --git a/Tests/Data/Mechanics/Ehlers/cube_1e1.prj b/Tests/Data/Mechanics/Ehlers/cube_1e1.prj
index c41313d7012937091055862e1d82d079b7233130..74070b4e1e2449fd1b6b80f25f15ce41a8163ad7 100644
--- a/Tests/Data/Mechanics/Ehlers/cube_1e1.prj
+++ b/Tests/Data/Mechanics/Ehlers/cube_1e1.prj
@@ -25,6 +25,7 @@
                 <mp>mp</mp>
                 <betap>betap</betap>
                 <gammap>gammap</gammap>
+                <tangent_type>Plastic</tangent_type>
                 <nonlinear_solver>
                     <maximum_iterations>100</maximum_iterations>
                     <error_tolerance>1e-14</error_tolerance>
diff --git a/Tests/Data/Mechanics/Ehlers/cube_1e3.prj b/Tests/Data/Mechanics/Ehlers/cube_1e3.prj
index c2a3b2009336583b4590d0d62e0c8a44fc2a501d..9f02f09a852b6ef26760d081376c127d8957edce 100644
--- a/Tests/Data/Mechanics/Ehlers/cube_1e3.prj
+++ b/Tests/Data/Mechanics/Ehlers/cube_1e3.prj
@@ -25,6 +25,7 @@
                 <mp>mp</mp>
                 <betap>betap</betap>
                 <gammap>gammap</gammap>
+                <tangent_type>Plastic</tangent_type>
                 <nonlinear_solver>
                     <maximum_iterations>100</maximum_iterations>
                     <error_tolerance>1e-14</error_tolerance>