diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index e93d871..b14cabc 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -4,7 +4,7 @@ image: debian:stretch
 test:
   script:
   - apt-get update -qy
-  - apt-get install -y --no-install-recommends python3-dev python3-pip python3-coverage python3-setuptools
+  - apt-get install -y --no-install-recommends python3-dev python3-pip python3-coverage python3-setuptools build-essential
   - pip3 install wheel
   - pip3 install -r requirements.txt
   - python3-coverage run --branch setup.py test