diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8f17382b31c4fff3f93b48257d822be58f31a2b5..b5aff3852bae9599d85aa429ad9da92400449c9f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -15,10 +15,10 @@ 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_CXX14   "Build DD4hep using c++14" OFF)
 option(CMAKE_MACOSX_RPATH "Build with rpath on macos" ON)