diff --git a/utils/libcxx/test/config.py b/utils/libcxx/test/config.py
index c941f65b2..1bd85faa3 100644
--- a/utils/libcxx/test/config.py
+++ b/utils/libcxx/test/config.py
@@ -241,7 +241,7 @@ class Configuration(object):
         flags = []
         compile_flags = _prefixed_env_list('INCLUDE', '-isystem')
         link_flags = _prefixed_env_list('LIB', '-L')
-        for path in _list_env_var('LIB'):
+        for path in _split_env_var('LIB'):
             self.add_path(self.exec_env, path)
         return CXXCompiler(clang_path, flags=flags,
                            compile_flags=compile_flags,