diff --git a/Rakefile b/Rakefile
index 3050f4aa..32b7dd4a 100644
--- a/Rakefile
+++ b/Rakefile
@@ -83,13 +83,6 @@ else
   task :compile => 'lib/racc/parser-text.rb'
 end
 
-task :sync_tool do
-  require 'fileutils'
-  FileUtils.cp "../ruby/tool/lib/core_assertions.rb", "./test/lib"
-  FileUtils.cp "../ruby/tool/lib/envutil.rb", "./test/lib"
-  FileUtils.cp "../ruby/tool/lib/find_executable.rb", "./test/lib"
-end
-
 task :build => "lib/racc/parser-text.rb"
 
 task :test => :compile