diff --git a/Tests/Data/RichardsMechanics/A2.prj b/Tests/Data/RichardsMechanics/A2.prj
index fd50bef72c079a2f3d521b923de6c428086d0a75..8a6f384edc86bd6dd3abc534380d18b93fc49641 100644
--- a/Tests/Data/RichardsMechanics/A2.prj
+++ b/Tests/Data/RichardsMechanics/A2.prj
@@ -475,7 +475,7 @@
         <vtkdiff>
             <regex>A2_ts_.*.vtu</regex>
             <field>sigma</field>
-            <absolute_tolerance>3e-8</absolute_tolerance>
+            <absolute_tolerance>4e-8</absolute_tolerance>
             <relative_tolerance>1e-15</relative_tolerance>
         </vtkdiff>
         <vtkdiff>