diff --git a/CMakeExternals/SimpleITK.cmake b/CMakeExternals/SimpleITK.cmake
index 1f6bff9370..87a11b0548 100644
--- a/CMakeExternals/SimpleITK.cmake
+++ b/CMakeExternals/SimpleITK.cmake
@@ -1,137 +1,139 @@
 #-----------------------------------------------------------------------------
 # SimpleITK
 #-----------------------------------------------------------------------------
 
 if(MITK_USE_SimpleITK)
 
  # Sanity checks
  if(DEFINED SimpleITK_DIR AND NOT EXISTS ${SimpleITK_DIR})
    message(FATAL_ERROR "SimpleITK_DIR variable is defined but corresponds to non-existing directory")
  endif()
 
   set(proj SimpleITK)
   set(proj_DEPENDENCIES ITK GDCM SWIG)
 
   if(MITK_USE_OpenCV)
     list(APPEND proj_DEPENDENCIES OpenCV)
   endif()
 
   set(SimpleITK_DEPENDS ${proj})
 
   if(NOT DEFINED SimpleITK_DIR)
 
     set(additional_cmake_args )
 
     list(APPEND additional_cmake_args
          -DWRAP_CSHARP:BOOL=OFF
          -DWRAP_TCL:BOOL=OFF
          -DWRAP_LUA:BOOL=OFF
          -DWRAP_PYTHON:BOOL=OFF
          -DWRAP_JAVA:BOOL=OFF
          -DWRAP_RUBY:BOOL=OFF
          -DWRAP_R:BOOL=OFF
         )
 
     if(MITK_USE_Python)
       list(APPEND additional_cmake_args
            -DWRAP_PYTHON:BOOL=ON
            -DPYTHON_EXECUTABLE:FILEPATH=${PYTHON_EXECUTABLE}
            -DPYTHON_INCLUDE_DIR:PATH=${PYTHON_INCLUDE_DIR}
            -DPYTHON_INCLUDE_DIR2:PATH=${PYTHON_INCLUDE_DIR2}
            -DPYTHON_LIBRARY:FILEPATH=${PYTHON_LIBRARY}
           )
     endif()
 
     if(CTEST_USE_LAUNCHERS)
       list(APPEND additional_cmake_args
         "-DCMAKE_PROJECT_${proj}_INCLUDE:FILEPATH=${CMAKE_ROOT}/Modules/CTestUseLaunchers.cmake"
       )
     endif()
 
     #TODO: Installer and testing works only with static libs on MAC
     set(_build_shared ON)
     if(APPLE)
       set(_build_shared OFF)
     endif()
     ExternalProject_Add(${proj}
        LIST_SEPARATOR ${sep}
        #GIT_REPOSITORY https://github.com/SimpleITK/SimpleITK.git
        # URL https://github.com/SimpleITK/SimpleITK/releases/download/v1.0.1/SimpleITK-1.0.1.tar.xz
        URL ${MITK_THIRDPARTY_DOWNLOAD_PREFIX_URL}/SimpleITK_9d510bef.tar.gz
        URL_MD5 c34f4d5259594bf1adf1d83f13228cbe
        # PATCH_COMMAND ${PATCH_COMMAND} -N -p1 -i ${CMAKE_CURRENT_LIST_DIR}/SimpleITK-0.8.1.patch
        INSTALL_COMMAND ""
        SOURCE_SUBDIR SuperBuild
        CMAKE_ARGS
          ${ep_common_cache_default_args}
          # -DCMAKE_BUILD_WITH_INSTALL_RPATH:BOOL=ON
       CMAKE_CACHE_ARGS
          ${ep_common_cache_args}
          ${additional_cmake_args}
          -DBUILD_SHARED_LIBS:BOOL=${_build_shared}
          -DSimpleITK_BUILD_DISTRIBUTE:BOOL=ON
          -DSimpleITK_PYTHON_THREADS:BOOL=ON
          -DSimpleITK_USE_SYSTEM_ITK:BOOL=ON
          -DITK_DIR:PATH=${ITK_DIR}
          -DSimpleITK_USE_SYSTEM_SWIG:BOOL=ON
          -DSWIG_DIR:PATH=${SWIG_DIR}
          -DSWIG_EXECUTABLE:FILEPATH=${SWIG_EXECUTABLE}
          -DBUILD_EXAMPLES:BOOL=OFF
          -DBUILD_TESTING:BOOL=OFF
          -DGDCM_DIR:PATH=${GDCM_DIR}
          -DHDF5_DIR:PATH=${HDF5_DIR}
          -DCMAKE_CXX_COMPILER:FILEPATH=${CMAKE_CXX_COMPILER}
          -DCMAKE_CXX_COMPILER_AR:FILEPATH=${CMAKE_CXX_COMPILER_AR}
          -DCMAKE_CXX_COMPILER_RANLIB:FILEPATH=${CMAKE_CXX_COMPILER_RANLIB}
          -DCMAKE_C_COMPILER:FILEPATH=${CMAKE_C_COMPILER}
          -DCMAKE_C_COMPILER_AR:FILEPATH=${CMAKE_C_COMPILER_AR}
          -DCMAKE_C_COMPILER_RANLIB:FILEPATH=${CMAKE_C_COMPILER_RANLIB}
        CMAKE_CACHE_DEFAULT_ARGS
          ${ep_common_cache_default_args}
        DEPENDS ${proj_DEPENDENCIES}
       )
 
     if( MITK_USE_Python )
       set(_sitk_build_dir ${ep_prefix}/src/SimpleITK-build)
       # Build python distribution with easy install. If a own runtime is used
       # embed the egg into the site-package folder of the runtime
 
       # Note: Userbase install could also be relevant in some cases Probably windows wants to
       # install to Lib/python3.6/
       # Build egg into custom user base folder and deploy it later into installer
       # https://pythonhosted.org/setuptools/easy_install.html#use-the-user-option-and-customize-pythonuserbase
       # PYTHONUSERBASE=${_install_dir} ${PYTHON_EXECUTABLE} setup.py --user
 
       # PythonDir needs to be fixed for the python interpreter by
       # changing dir delimiter for Windows
 
       set(_install_dir ${ep_prefix} )
       set(_pythonpath ${ep_prefix}/lib/python${PYTHON_VERSION_MAJOR}.${PYTHON_VERSION_MINOR}/site-packages )
 
       if(WIN32)
         STRING(REPLACE "/" "\\\\" _install_dir ${_install_dir})
+        set(_additional_pythonpath $<SEMICOLON>${ep_prefix}/Lib/site-packages)
       else()
         # escape spaces in the install path for linux
         STRING(REPLACE " " "\ " _install_dir ${_install_dir})
+        set(_additional_pythonpath )
       endif()
 
       ExternalProject_Add_Step(${proj} sitk_python_install_step
-        COMMAND ${CMAKE_COMMAND} -E env PYTHONPATH=${_pythonpath}$<SEMICOLON>${ep_prefix}/Lib/site-packages ${PYTHON_EXECUTABLE} Packaging/setup.py install --prefix=${_install_dir}
+        COMMAND ${CMAKE_COMMAND} -E env PYTHONPATH=${_pythonpath}${_additional_pythonpath} ${PYTHON_EXECUTABLE} Packaging/setup.py install --prefix=${_install_dir}
         DEPENDEES install
         WORKING_DIRECTORY ${_sitk_build_dir}/SimpleITK-build/Wrapping/Python/
       )
 
     endif()
 
     mitkFunctionInstallExternalCMakeProject(${proj})
     # Still need to install the SimpleITK Python wrappings
   else()
 
     mitkMacroEmptyExternalProject(${proj} "${proj_DEPENDENCIES}")
 
   endif()
 
   set(SimpleITK_DIR ${ep_prefix}/src/SimpleITK-build/SimpleITK-build)
 
 endif()