diff --git a/.isort.cfg b/.isort.cfg
index e2f17c1..453b0a3 100644
--- a/.isort.cfg
+++ b/.isort.cfg
@@ -4,6 +4,7 @@ multi_line_output=0
 lines_after_imports=2
 add_imports=from __future__ import unicode_literals
 sections=FUTURE,STDLIB,THIRDPARTY,INDICO,FIRSTPARTY,LOCALFOLDER
+known_third_party=flask_multipass,flask_pluginengine
 known_indico=indico
 skip_glob=20??????????_*_*.py
 not_skip=__init__.py