diff --git a/examples/CLICSiD/scripts/testDDPython.py b/examples/CLICSiD/scripts/testDDPython.py
index 5276770e8a0db4ca6c85a27d2f260904611a6a5a..b162a7d0256ac4fd8f95560852c8ecfe67d84963 100644
--- a/examples/CLICSiD/scripts/testDDPython.py
+++ b/examples/CLICSiD/scripts/testDDPython.py
@@ -3,6 +3,7 @@ from ROOT import gSystem
 import os, logging, platform
 if platform.system()=="Darwin":
   gSystem.SetDynamicPath(os.environ['DD4HEP_LIBRARY_PATH'])
+gSystem.Load('libglapi')
 gSystem.Load('libDDPython')
 from ROOT import dd4hep as Core