diff --git a/examples/ClientTests/CMakeLists.txt b/examples/ClientTests/CMakeLists.txt
index 66efc761d5fa420b99c89510e1d8c4c480a7a116..f34a2c3d828105477064f65c4ce8e50557b70b02 100644
--- a/examples/ClientTests/CMakeLists.txt
+++ b/examples/ClientTests/CMakeLists.txt
@@ -80,7 +80,7 @@ foreach (test Assemblies BoxTrafos LheD_tracker MagnetFields MiniTel SiliconBloc
   #
   # Geant4 material scan. From position=0,0,0 to end-of-world 
   if (DD4HEP_USE_GEANT4)
-    dd4hep_add_test_reg( ClientTests_${test}_g4material_scan
+    dd4hep_add_test_reg( ClientTests_${test}_g4material_scan_LONGTEST
       COMMAND    "${CMAKE_INSTALL_PREFIX}/bin/run_test_ClientTests.sh"
       EXEC_ARGS  python ${DD4hep_DIR}/python/g4MaterialScan.py
                         --compact=file:${CMAKE_CURRENT_SOURCE_DIR}/compact/${test}.xml
@@ -102,7 +102,7 @@ foreach (test BoxTrafos IronCylinder MiniTel SiliconBlock NestedSimple MultiColl
     REGEX_PASS " Execution finished..." )
   #
   # ROOT Geometry overlap checks
-  dd4hep_add_test_reg( ClientTests_${test}_check_overlaps
+  dd4hep_add_test_reg( ClientTests_${test}_check_overlaps_LONGTEST
     COMMAND    "${CMAKE_INSTALL_PREFIX}/bin/run_test_ClientTests.sh"
     EXEC_ARGS  python ${DD4hep_DIR}/python/checkOverlaps.py 
                       --compact=file:${CMAKE_CURRENT_SOURCE_DIR}/compact/${test}.xml