diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 8430a3dea7ff6ebc322d3bb4a6923b9bd5e8f700..f3252d4a66eba219d50e85d2a7e5e8a03b8bc36c 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -33,7 +33,7 @@ pages:
   script:
   - cd Build
   - apt-get update
-  - apt-get install ttf-freefont graphviz
+  - apt-get install -y ttf-freefont graphviz
   - make doc
   - mv ../doc/html/ ../public/
   artifacts: