diff --git a/app/models/fluentd.rb b/app/models/fluentd.rb
index c7c08e8..e26c23c 100644
--- a/app/models/fluentd.rb
+++ b/app/models/fluentd.rb
@@ -157,5 +157,6 @@ class Fluentd
 
   def destroy
     File.unlink(JSON_PATH)
+    File.unlink(Plugin.gemfile_path)
   end
 end