diff --git a/tool/sync_default_gems.rb b/tool/sync_default_gems.rb
index 5d428c5d37..bb4fcdd2cc 100644
--- a/tool/sync_default_gems.rb
+++ b/tool/sync_default_gems.rb
@@ -94,10 +94,12 @@ def sync_default_gems(gem)
     `cp -r ../../bundler/bundler/man/*.{1,5,1\.txt,5\.txt,ronn} ./man`
     `rm -rf spec/bundler/support/artifice/vcr_cassettes`
   when "rdoc"
-    `rm -rf lib/rdoc* test/rdoc`
+    `rm -rf lib/rdoc* test/rdoc libexec/rdoc libexec/ri`
     `cp -rf ../rdoc/lib/rdoc* ./lib`
     `cp -rf ../rdoc/test test/rdoc`
     `cp ../rdoc/rdoc.gemspec ./lib/rdoc`
+    `cp -rf ../rdoc/exe/rdoc ./libexec`
+    `cp -rf ../rdoc/exe/ri ./libexec`
     `rm -f lib/rdoc/markdown.kpeg lib/rdoc/markdown/literals.kpeg lib/rdoc/rd/block_parser.ry lib/rdoc/rd/inline_parser.ry`
     `git checkout lib/rdoc/.document`
   when "json"