diff --git a/gitlab_docker_autodep/server.py b/gitlab_docker_autodep/server.py
index da65c4cbe410b7e50b7391a9c95ac8b942e13373..bbc320621b8d6091c850657528d4b71e66be2e5c 100644
--- a/gitlab_docker_autodep/server.py
+++ b/gitlab_docker_autodep/server.py
@@ -10,7 +10,7 @@ except ImportError:
     import queue as Queue
 
 from cheroot import wsgi
-from flask import Flask, request, make_response
+from flask import Flask, request, make_response, abort
 
 from .rebuild import rebuild