diff --git a/test/Unit/lit.site.cfg.in b/test/Unit/lit.site.cfg.in
index fb459f5..49b796f 100644
--- a/test/Unit/lit.site.cfg.in
+++ b/test/Unit/lit.site.cfg.in
@@ -6,10 +6,4 @@
 config.shlibdir = "@SHLIBDIR@"
 config.target_triple = "@TARGET_TRIPLE@"
 
-# Make sure any custom vars defined above that are required in lit.local.cfg
-# files are made available.
-def on_clone(parent, clone, path):
-  clone.extra_tools_src_dir = parent.extra_tools_src_dir
-
-config.on_clone = on_clone
 lit_config.load_config(config, "@CLANG_TOOLS_SOURCE_DIR@/test/Unit/lit.cfg")