diff --git a/tool/sync_default_gems.rb b/tool/sync_default_gems.rb
index 40a1dab17e..80ba596ae7 100644
--- a/tool/sync_default_gems.rb
+++ b/tool/sync_default_gems.rb
@@ -303,7 +303,7 @@ def sync_default_gems(gem)
   when "digest"
     rm_rf(%w[ext/digest test/digest])
     cp_r("#{upstream}/ext/digest", "ext")
-    mkdir_p("#{upstream}/ext/digest/lib")
+    mkdir_p("ext/digest/lib")
     cp_r("#{upstream}/lib/digest.rb", "ext/digest/lib/")
     cp_r("#{upstream}/test/digest", "test")
     cp_r("#{upstream}/digest.gemspec", "ext/digest")