diff --git a/src/Mod/Fem/femobjects/_FemConstraintBodyHeatSource.py b/src/Mod/Fem/femobjects/_FemConstraintBodyHeatSource.py
index 35804d082f..460919101f 100644
--- a/src/Mod/Fem/femobjects/_FemConstraintBodyHeatSource.py
+++ b/src/Mod/Fem/femobjects/_FemConstraintBodyHeatSource.py
@@ -37,7 +37,7 @@ class Proxy(FemConstraint.Proxy):
     def __init__(self, obj):
         super(Proxy, self).__init__(obj)
         obj.addProperty(
-            "App::PropertyFloat"
+            "App::PropertyFloat",
             "HeatSource",
             "Base",
             "Body heat source"