diff --git a/unittest/force-styles/CMakeLists.txt b/unittest/force-styles/CMakeLists.txt
index a2a7d47ef2..4e757b4703 100644
--- a/unittest/force-styles/CMakeLists.txt
+++ b/unittest/force-styles/CMakeLists.txt
@@ -64,9 +64,9 @@ endif()
 
 # prepare environment for testers
 if(WIN32)
-  set(FORCE_TEST_ENVIRONMENT PYTHONPATH=${TEST_INPUT_FOLDER}:${LAMMPS_PYTHON_PATH})
+  set(FORCE_TEST_ENVIRONMENT PYTHONPATH=${TEST_INPUT_FOLDER}:${LAMMPS_PYTHON_DIR})
 else()
-  set(FORCE_TEST_ENVIRONMENT PYTHONPATH=${TEST_INPUT_FOLDER}:${LAMMPS_PYTHON_PATH}:$ENV{PYTHONPATH})
+  set(FORCE_TEST_ENVIRONMENT PYTHONPATH=${TEST_INPUT_FOLDER}:${LAMMPS_PYTHON_DIR}:$ENV{PYTHONPATH})
 endif()
 list(APPEND FORCE_TEST_ENVIRONMENT "PYTHONUNBUFFERED=1")
 list(APPEND FORCE_TEST_ENVIRONMENT "PYTHONDONTWRITEBYTECODE=1")