diff --git a/DDG4/python/SystemOfUnits.py b/DDG4/python/SystemOfUnits.py
deleted file mode 100644
index 5e0fb31e1443029fcb29fb00750eeff7f09b14a0..0000000000000000000000000000000000000000
--- a/DDG4/python/SystemOfUnits.py
+++ /dev/null
@@ -1,18 +0,0 @@
-# ==========================================================================
-#  AIDA Detector description implementation
-# --------------------------------------------------------------------------
-# Copyright (C) Organisation europeenne pour la Recherche nucleaire (CERN)
-# All rights reserved.
-#
-# For the licensing terms see $DD4hepINSTALL/LICENSE.
-# For the list of contributors see $DD4hepINSTALL/doc/CREDITS.
-#
-# ==========================================================================
-#
-#  BACKWARDS COMPATIBILITY FILE!
-#  The namespace "DD4hep" is deprecated. Please use "dd4hep" instead.
-#
-# ==========================================================================
-from __future__ import absolute_import, unicode_literals, print_function
-from g4units import *
-print('DEPRECATION WARNING  The namespace "SystemOfUnits" is deprecated. Please use "g4units" instead.')