diff --git a/cmake/thisdd4hep.sh b/cmake/thisdd4hep.sh
index 2f6f369989af2caf42f46df783c618c2b3f9e661..f6da3ecaab5dbb3ea43dad3eeff7a465816ccaa7 100644
--- a/cmake/thisdd4hep.sh
+++ b/cmake/thisdd4hep.sh
@@ -112,7 +112,7 @@ dd4hep_add_path PATH       ${THIS}/bin;
 #----LIBRARY_PATH-------------------------------------------------------------
 dd4hep_add_library_path    ${THIS}/lib;
 #----PYTHONPATH---------------------------------------------------------------
-dd4hep_add_path PYTHONPATH ${THIS}/python;
+dd4hep_add_path PYTHONPATH ${THIS}/lib/python@Python_VERSION_MAJOR@.@Python_VERSION_MINOR@/site-packages;
 #----ROOT_INCLUDE_PATH--------------------------------------------------------
 dd4hep_add_path ROOT_INCLUDE_PATH ${THIS}/include;
 #-----------------------------------------------------------------------------