diff --git a/app/controllers/submissions_controller.rb b/app/controllers/submissions_controller.rb
index a1a804f1..62fe6320 100644
--- a/app/controllers/submissions_controller.rb
+++ b/app/controllers/submissions_controller.rb
@@ -113,7 +113,7 @@ class SubmissionsController < ApplicationController
             parsed = JSON.parse(data)
             if parsed['cmd'] == 'exit'
               Rails.logger.info("Client killed container.")
-              @docker_client.kill_container(result[:container])
+              @docker_client.exit_container(result[:container])
             else
               socket.send data
             end