diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 1756242fc2512b415845ea5b4bf37e878569467a..ffae2679c323305a8c7457d7860da8369358cc8c 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -9,6 +9,7 @@ test-centos7:
   - yum install install -y python34-pip python34-devel
   - yum install -y gcc graphviz graphviz-devel
   - yum install -y httpd httpd-devel
+  - yum install gcc-c++
   - cd ippisite
   - pip3 install -r requirements.txt
   - python3 manage.py test