diff --git a/tutorials/physics/X-ray/fluorescence.mac b/tutorials/physics/X-ray/fluorescence.mac
index 75cdae7..03e8a42 100644
--- a/tutorials/physics/X-ray/fluorescence.mac
+++ b/tutorials/physics/X-ray/fluorescence.mac
@@ -2,8 +2,6 @@
 
 # https://geant4.web.cern.ch/node/1620
 /physics_lists/select LBE_LIV
-# /process/em/ only exists with radioactive decay being enabled
-/physics_lists/factory/addRadioactiveDecay
 # PIXE must be used to enable the creation of characteristic X-rays
 /process/em/pixe true
 /run/initialize