diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 4cef7ebcbb929580873804f6b142beeae7777bb7..aaf07d1781df8dee136afb277836b9449213dd27 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -35,4 +35,4 @@ unit-test-job:   # This job runs in the test stage.
     - which pip3
     - pip install -r requirements.txt
     - sh install.sh
-    - python tests/test_flip_image.py
+    - python3 tests/test_flip_image.py