diff --git a/CMakeLists.txt b/CMakeLists.txt
index efb4de1c824c48ee357424def368ca2ee1e6f4f9..6d3b529a69107060bb13a2285a3f0a2ab86f7d55 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -16,10 +16,10 @@ ENDIF(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
 
 #---Options-------------------------------------------------------------------------
 option(DD4HEP_USE_XERCESC "Enable 'Detector Builders' based on XercesC"   OFF)
-option(DD4HEP_USE_PYROOT  "Enable 'Detector Builders' based on PyROOT"    ON )  # does not work (compile error)
-option(DD4HEP_USE_GEANT4  "Enable the simulation part based on Geant4"    ON )
-option(DD4HEP_USE_GEAR    "Build gear wrapper for backward compatibility" ON )
-option(DD4HEP_USE_LCIO    "Build lcio extensions"    ON )
+option(DD4HEP_USE_PYROOT  "Enable 'Detector Builders' based on PyROOT"    OFF)  # does not work (compile error)
+option(DD4HEP_USE_GEANT4  "Enable the simulation part based on Geant4"    OFF)
+option(DD4HEP_USE_GEAR    "Build gear wrapper for backward compatibility" OFF)
+option(DD4HEP_USE_LCIO    "Build lcio extensions"    OFF)
 option(BUILD_TESTING      "Enable and build tests"   ON)
 option(DD4HEP_USE_CXX11   "Build DD4hep using c++11" OFF)
 #