diff --git a/examples/ClientTests/scripts/Assemblies.py b/examples/ClientTests/scripts/Assemblies.py
index ab6dac5abcfa6cc4f07ed73fa05819cda53d1200..19edc719ffd2a71c34199707bd28dce8acb38a27 100644
--- a/examples/ClientTests/scripts/Assemblies.py
+++ b/examples/ClientTests/scripts/Assemblies.py
@@ -10,7 +10,6 @@
 # ==========================================================================
 from __future__ import absolute_import, unicode_literals
 import os
-import sys
 import time
 import DDG4
 from g4units import GeV, mm, cm
diff --git a/examples/ClientTests/scripts/LheD_tracker.py b/examples/ClientTests/scripts/LheD_tracker.py
index 512025c67451ddd58689273205d0b49fa957429b..be9b9d4a5565a3e50188567eda2d2b0bcf574ebf 100644
--- a/examples/ClientTests/scripts/LheD_tracker.py
+++ b/examples/ClientTests/scripts/LheD_tracker.py
@@ -12,7 +12,6 @@
 #
 from __future__ import absolute_import, unicode_literals
 import os
-import sys
 import time
 import DDG4
 from DDG4 import OutputLevel as Output
diff --git a/examples/ClientTests/scripts/MiniTel_hepmc.py b/examples/ClientTests/scripts/MiniTel_hepmc.py
index ed08f33319247a74c0874be1c15101f09f954a75..e0202dc12c236cf93eb9844279463cd42703bc01 100644
--- a/examples/ClientTests/scripts/MiniTel_hepmc.py
+++ b/examples/ClientTests/scripts/MiniTel_hepmc.py
@@ -10,7 +10,6 @@
 # ==========================================================================
 from __future__ import absolute_import, unicode_literals
 import os
-import sys
 import DDG4
 #
 """
diff --git a/examples/ClientTests/scripts/NestedDetectors.py b/examples/ClientTests/scripts/NestedDetectors.py
index f5f2f099f6dfb23f79982df5607e4629fbe26e0e..104074763bdf66609a5f3abe79afb6dda5fc87d4 100644
--- a/examples/ClientTests/scripts/NestedDetectors.py
+++ b/examples/ClientTests/scripts/NestedDetectors.py
@@ -10,7 +10,6 @@
 # ==========================================================================
 from __future__ import absolute_import, unicode_literals
 import os
-import sys
 import time
 import DDG4
 from DDG4 import OutputLevel as Output