diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 23802f4f469bad3069bf1ac6a0bf58d73542f9be..0d2507450071bee82846e301a81d7f29f9df613e 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -44,7 +44,7 @@ Python 3 + Barvinok:
   - python3 -m venv .env
   - source .env/bin/activate
   - python -m ensurepip
-  - pip install cffi
+  - pip install cffi pcpp
   - "./build-with-barvinok.sh"
   tags:
   - python3