diff --git a/src/Mod/Fem/femtest/data/calculix/ccx_cantilever_beam_pipe.inp b/src/Mod/Fem/femtest/data/calculix/ccx_cantilever_beam_pipe.inp
index b2366b0f1862..5f821931acb1 100644
--- a/src/Mod/Fem/femtest/data/calculix/ccx_cantilever_beam_pipe.inp
+++ b/src/Mod/Fem/femtest/data/calculix/ccx_cantilever_beam_pipe.inp
@@ -45,6 +45,9 @@ Eedges
 *NSET,NSET=ConstraintFixed
 1,
 
+** Physical constants for SI(mm) unit system with Kelvins
+*PHYSICAL CONSTANTS, ABSOLUTE ZERO=0, STEFAN BOLTZMANN=5.670374419e-11
+
 ***********************************************************
 ** Materials
 ** see information about units at file end