diff --git a/lib/embulk/output/command.rb b/lib/embulk/output/command.rb
deleted file mode 100644
index 284d935..0000000
--- a/lib/embulk/output/command.rb
+++ /dev/null
@@ -1,3 +0,0 @@
-Embulk::JavaPlugin.register_output(
-  "command", "org.embulk.output.CommandFileOutputPlugin",
-  File.expand_path('../../../../classpath', __FILE__))