diff --git a/freecad/PyrateWorkbench/Observer_OpticalSystem.py b/freecad/PyrateWorkbench/Observer_OpticalSystem.py
index fe74a0f..3352f98 100644
--- a/freecad/PyrateWorkbench/Observer_OpticalSystem.py
+++ b/freecad/PyrateWorkbench/Observer_OpticalSystem.py
@@ -246,7 +246,7 @@ def initDemoSystem(self):
         image = Surface(lc8)
 
 
-        elem = OpticalElement(lc0, label="lenssystem")
+        elem = OpticalElement(lc0, name="lenssystem")
 
         glass = material_isotropic.ConstantIndexGlass(lc0, n=1.7)
         glass2 = material_isotropic.ConstantIndexGlass(lc0, n=1.5)