diff --git a/Rakefile b/Rakefile
index 5d48c43..845924b 100644
--- a/Rakefile
+++ b/Rakefile
@@ -170,7 +170,7 @@ task :build => [:"mruby:init", :build_merge, :build_to_c, :"mruby:build_config",
   sh "cp #{MRUBY_BIN}/mruby #{BUILD_DIR}/portable/"
   sh "mv #{BUILD_DIR}/main.rb #{BUILD_DIR}/portable/"
   sh "rm #{BUILD_DIR}/*.h; rm #{BUILD_DIR}/*.c"
-  sh "tar -czvf #{BUILD_DIR}/app.tar.gz #{BUILD_DIR}"
+  sh "tar -czvf --exclude=#{BUILD_DIR}/app.tar.gz #{BUILD_DIR}/app.tar.gz #{BUILD_DIR}"
 end