diff --git a/unittest/c-library/CMakeLists.txt b/unittest/c-library/CMakeLists.txt
index 121c42f7fd..3c24cdcff4 100644
--- a/unittest/c-library/CMakeLists.txt
+++ b/unittest/c-library/CMakeLists.txt
@@ -11,6 +11,7 @@ add_executable(test_library_properties test_library_properties.cpp test_main.cpp
 target_link_libraries(test_library_properties PRIVATE lammps GTest::GTest GTest::GMock)
 target_compile_definitions(test_library_properties PRIVATE -DTEST_INPUT_FOLDER=${CMAKE_CURRENT_SOURCE_DIR})
 add_test(LibraryProperties test_library_properties)
+set_tests_properties(LibraryProperties PROPERTIES ENVIRONMENT "LAMMPS_POTENTIALS=${LAMMPS_POTENTIALS_DIR}")
 
 set(TEST_CONFIG_DEFS "-DTEST_INPUT_FOLDER=${CMAKE_CURRENT_SOURCE_DIR};-DLAMMPS_${LAMMPS_SIZES}")
 set(PKG_COUNT 0)