Index: bindings/python/tests/CMakeLists.txt
===================================================================
--- bindings/python/tests/CMakeLists.txt
+++ bindings/python/tests/CMakeLists.txt
@@ -1,7 +1,9 @@
 # Test target to run Python test suite from main build.
 
 add_custom_target(check-clang-python
-    COMMAND CLANG_LIBRARY_PATH=$<TARGET_FILE_DIR:libclang> ${PYTHON_EXECUTABLE} -m unittest discover
+    COMMAND ${CMAKE_COMMAND} -E env
+            CLANG_LIBRARY_PATH=$<TARGET_FILE_DIR:libclang>
+            ${PYTHON_EXECUTABLE} -m unittest discover
     DEPENDS libclang
     WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/..)