diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index f507e02a6bdfce72fd247c0be79e25070f34d390..c983c3484b06d4838ee3e8d129236ce629c7e78f 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -362,7 +362,7 @@ install-clang-8:
     - cmake --build . -- -j4
     - set -o pipefail
     - ctest -j4
-    - make install
+    - make -j4 install
     - mkdir -p build_examples
     - cd build_examples
     - cmake -DCMAKE_BUILT_TYPE=Release ../install/share/corsika/examples