diff --git a/test/lit.cfg b/test/lit.cfg
index 7c07fd54..1becd769 100644
--- a/test/lit.cfg
+++ b/test/lit.cfg
@@ -60,7 +60,7 @@ if cling_obj_root is not None:
     # For MacOS with libc++, out clang will not find libc++ causing errors with
     # STL. Use the XCode one instead by not adding ours to the path. Cling is
     # still found through deferCling().
-    if platform.mac_ver() is None or \
+    if platform.mac_ver()[0] is '' or \
       float('.'.join(platform.mac_ver()[0].split('.')[:2])) < 10.9:
         config.environment['PATH'] = path