diff --git a/app/models/submission.rb b/app/models/submission.rb
index 5a5ed14e..6256b446 100644
--- a/app/models/submission.rb
+++ b/app/models/submission.rb
@@ -185,10 +185,18 @@ class Submission < ApplicationRecord
 
   private
 
+  def copy_files_to(container)
+    files = {}
+    collect_files.each do |file|
+      files[file.name_with_extension] = file.content
+    end
+    container.copy_files(files)
+  end
+
   def prepared_container
     request_time = Time.now
     container = Runner.new(execution_environment, execution_environment.permitted_execution_time)
-    container.copy_submission_files self
+    copy_files_to container
     container.waiting_time = Time.now - request_time
     yield(container) if block_given?
     container.destroy
diff --git a/lib/runner/runner.rb b/lib/runner/runner.rb
index 5e850e9e..d8ae60b8 100644
--- a/lib/runner/runner.rb
+++ b/lib/runner/runner.rb
@@ -21,14 +21,6 @@ class Runner
     Faraday.patch(url, body.to_json, HEADERS)
   end
 
-  def copy_submission_files(submission)
-    files = {}
-    submission.collect_files.each do |file|
-      files[file.name_with_extension] = file.content
-    end
-    copy_files(files)
-  end
-
   def execute_command(command)
     url = "#{runner_url}/execute"
     response = Faraday.post(url, {command: command}.to_json, HEADERS)