diff --git a/doc/CMakeLists.txt b/doc/CMakeLists.txt
index 03f40173..e847803e 100644
--- a/doc/CMakeLists.txt
+++ b/doc/CMakeLists.txt
@@ -50,7 +50,7 @@ endforeach()
 add_custom_target(docs_sphinx ALL)
 add_custom_command(
   TARGET docs_sphinx
-  COMMAND PYTHONPATH=${CMAKE_BINARY_DIR}/python:$ENV{PYTHONPATH} ${TRIQS_SPHINXBUILD_EXECUTABLE} -c . -j8 -b html ${CMAKE_CURRENT_SOURCE_DIR} html
+  COMMAND PYTHONPATH=${PROJECT_BINARY_DIR}/python:$ENV{PYTHONPATH} ${TRIQS_SPHINXBUILD_EXECUTABLE} -c . -j8 -b html ${CMAKE_CURRENT_SOURCE_DIR} html
 )
 
 option(Sphinx_Only "When building the documentation, skip the Python Modules and the generation of C++ Api and example outputs" OFF)
diff --git a/test/python/CMakeLists.txt b/test/python/CMakeLists.txt
index da8f6dcb..4f6bdcb9 100644
--- a/test/python/CMakeLists.txt
+++ b/test/python/CMakeLists.txt
@@ -11,5 +11,5 @@ foreach(test ${all_tests})
   get_filename_component(test_name ${test} NAME_WE)
   get_filename_component(test_dir ${test} DIRECTORY)
   add_test(NAME Py_${test_name} COMMAND ${TRIQS_PYTHON_INTERPRETER} ${CMAKE_CURRENT_SOURCE_DIR}/${test_dir}/${test_name}.py WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/${test_dir})
-  set_property(TEST Py_${test_name} APPEND PROPERTY ENVIRONMENT PYTHONPATH=${CMAKE_BINARY_DIR}/python:$ENV{PYTHONPATH} ${SANITIZER_RT_PRELOAD})
+  set_property(TEST Py_${test_name} APPEND PROPERTY ENVIRONMENT PYTHONPATH=${PROJECT_BINARY_DIR}/python:$ENV{PYTHONPATH} ${SANITIZER_RT_PRELOAD})
 endforeach()