diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 4a348663760ddd1c9decf9e3b9a95dbb78b09664..536b627568de7409daaa2d9997f5e111888d630b 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -6,3 +6,4 @@ build:
     - pip install --upgrade pip setuptools wheel
     - pip install cython
     - pip install '.'
+    - tox