diff --git a/src/Mod/Fem/femobjects/constraint_bodyheatsource.py b/src/Mod/Fem/femobjects/constraint_bodyheatsource.py
index f4b17fa5ee..f858aedb36 100644
--- a/src/Mod/Fem/femobjects/constraint_bodyheatsource.py
+++ b/src/Mod/Fem/femobjects/constraint_bodyheatsource.py
@@ -54,4 +54,4 @@ class ConstraintBodyHeatSource(base_fempythonobject.BaseFemPythonObject):
                 "Base",
                 "Body heat source"
             )
-        obj.HeatSource = 0.0
+            obj.HeatSource = 0.0