diff --git a/Tests/Data/TH2M/submesh_residuum_assembly/p_G.xml b/Tests/Data/TH2M/submesh_residuum_assembly/p_G.xml
index cd8022ca8472db6fc8d5b7571523998ac5bc019e..f5c5a970129014c7c42ff3468c2466217287bd0a 100644
--- a/Tests/Data/TH2M/submesh_residuum_assembly/p_G.xml
+++ b/Tests/Data/TH2M/submesh_residuum_assembly/p_G.xml
@@ -80,7 +80,7 @@
     <add sel="/*/time_loop/submesh_residuum_output">
         <prefix>p_G_{:meshname}</prefix>
     </add>
-    
+
     <add sel="/*/time_loop/output/variables">
         <variable>HeatFlowRate</variable>
         <variable>GasMassFlowRate</variable>
@@ -125,7 +125,7 @@
             <vtkdiff>
                 <regex>p_G.*_ts_[0-9]*_.*\.vtu</regex>
                 <field>capillary_pressure_interpolated</field>
-                <absolute_tolerance>5.3e-10</absolute_tolerance>
+                <absolute_tolerance>6e-10</absolute_tolerance>
                 <relative_tolerance>0</relative_tolerance>
             </vtkdiff>
             <vtkdiff>
diff --git a/scripts/cmake/test/AddTest.cmake b/scripts/cmake/test/AddTest.cmake
index b006b4ac41050e8ed86fce846354c62c5963d414..b5267b419b50cc2ce759bd057cd4bd225fc1fdf0 100644
--- a/scripts/cmake/test/AddTest.cmake
+++ b/scripts/cmake/test/AddTest.cmake
@@ -258,15 +258,6 @@ function(AddTest)
         list(APPEND labels large)
     endif()
 
-    _add_test(${TEST_NAME})
-
-    # OpenMP tests for specific processes only. TODO (CL) Once all processes can
-    # be assembled OpenMP parallel, the condition should be removed.
-    if("${labels}" MATCHES "TH2M|ThermoRichards")
-        _add_test(${TEST_NAME}-omp)
-        _set_omp_test_properties()
-    endif()
-
     if(AddTest_PYTHON_PACKAGES)
         list(APPEND labels python_modules)
         if(OGS_USE_PIP)
@@ -287,6 +278,15 @@ function(AddTest)
         endif()
     endif()
 
+    _add_test(${TEST_NAME})
+
+    # OpenMP tests for specific processes only. TODO (CL) Once all processes can
+    # be assembled OpenMP parallel, the condition should be removed.
+    if("${labels}" MATCHES "TH2M|ThermoRichards")
+        _add_test(${TEST_NAME}-omp)
+        _set_omp_test_properties()
+    endif()
+
     add_dependencies(ctest ${AddTest_EXECUTABLE})
     add_dependencies(ctest-large ${AddTest_EXECUTABLE})