diff --git a/ProcessLib/HT/Tests.cmake b/ProcessLib/HT/Tests.cmake
index b509c57a9fd28d6e3bce4457b112871b0d13d388..4bd3048963bbb0735181a72f7af9f92885d32024 100644
--- a/ProcessLib/HT/Tests.cmake
+++ b/ProcessLib/HT/Tests.cmake
@@ -186,9 +186,9 @@ AddTest(
     TESTER vtkdiff
     REQUIREMENTS NOT (OGS_USE_LIS OR OGS_USE_MPI)
     DIFF_DATA
-    square_5500x5500.vtu ConstViscosityThermalConvection_pcs_1_ts_149_t_50000000000.000000.vtu T_ref T 1e-16  1.e-16
-    square_5500x5500.vtu ConstViscosityThermalConvection_pcs_1_ts_149_t_50000000000.000000.vtu p_ref p  1e-16  1.e-16
-    square_5500x5500.vtu ConstViscosityThermalConvection_pcs_1_ts_149_t_50000000000.000000.vtu darcy_velocity_ref darcy_velocity  1e-16  1.e-16
+    square_5500x5500.vtu ConstViscosityThermalConvection_pcs_1_ts_149_t_50000000000.000000.vtu T_ref T 1e-1  1.e-3
+    square_5500x5500.vtu ConstViscosityThermalConvection_pcs_1_ts_149_t_50000000000.000000.vtu p_ref p  1e-1  1.e-3
+    square_5500x5500.vtu ConstViscosityThermalConvection_pcs_1_ts_149_t_50000000000.000000.vtu darcy_velocity_ref darcy_velocity  1e-1  1.e-3
     VIS ConstViscosityThermalConvection_pcs_1_ts_149_t_50000000000.000000.vtu
 )