diff --git a/cmake_modules/SuperBuild.cmake b/cmake_modules/SuperBuild.cmake
index 8cf3086e..4a56820c 100644
--- a/cmake_modules/SuperBuild.cmake
+++ b/cmake_modules/SuperBuild.cmake
@@ -80,6 +80,7 @@ if (USE_PYTHON)
 
     set(PYTHON_LIBS "${PYTHON_LIBRARIES}")
     execute_process(COMMAND ${PYTHON_EXECUTABLE} -c "from distutils.sysconfig import get_python_lib; print(get_python_lib(1,0,''))" OUTPUT_VARIABLE PYTHON_PACKAGES_INSTALL_DIR OUTPUT_STRIP_TRAILING_WHITESPACE)
+    file(TO_CMAKE_PATH ${PYTHON_PACKAGES_INSTALL_DIR} PYTHON_PACKAGES_INSTALL_DIR)
     set_vars(NETGEN_CMAKE_ARGS PYTHON_LIBS PYTHON_LIBRARY PYTHON_PACKAGES_INSTALL_DIR PYTHON_INCLUDE_DIR PYBIND_INCLUDE_DIR PYTHON_LIBRARIES PYTHON_EXECUTABLE PYTHON_VERSION)
 endif (USE_PYTHON)