diff --git a/app.rb b/app.rb
index 55bad0a..96da953 100644
--- a/app.rb
+++ b/app.rb
@@ -530,5 +530,8 @@ get "/kitty" do
         out << f.read(CHUNK_SIZE)
       end
     end
+  ensure
+    f.close
+    f.unlink
   end
 end