diff --git a/.gitlab/ci/build.gitlab-ci.yml b/.gitlab/ci/build.gitlab-ci.yml
index 43ddf86dc4fdd92f70cb386ece52d59dcee109e8..faaf1b3488db098e90ead2f730475e6ddf5d8d62 100644
--- a/.gitlab/ci/build.gitlab-ci.yml
+++ b/.gitlab/ci/build.gitlab-ci.yml
@@ -24,6 +24,7 @@ build:ubuntu_cpp_clang:
     - docker
 
   script:
+    - apt install clang
     - mkdir -p build_cpp
     - mkdir -p install_cpp
     - cd build_cpp