diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index bec8b83257775770b6ecc04c3f9fa1fb6968b135..a42500e22adf3b21bb3a17d10a9a6a7c1edfb0e7 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -4,7 +4,7 @@ test-centos7:
   script:
   - yum install -y epel-release
   - yum install install -y python34-pip python34-devel
-  - yum install -y graphviz graphviz-devel
+  - yum install -y gcc graphviz graphviz-devel
   - cd ippisite
   - pip3 install -r requirements.txt
   - python3 manage.py test
\ No newline at end of file