diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 116b7a64d2283ad7545fbed02559f70a1893ca1a_LmdpdGxhYi1jaS55bWw=..e9a34189eb92020c03f5885d6ff7dc2882c8ed42_LmdpdGxhYi1jaS55bWw= 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,7 +1,7 @@
 tests-5.2:
    image: octobus/ci-py2-hgext3rd:hg-5.2
    script:
-      - flake8 heptapod setup.py
+      - flake8 heptapod setup.py hgext3rd
       # TODO put py.test in the image
       # the py.test version combination is the consistent one
       # provided by Fedora 30 for python2