diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 6fb4e092f77bfbba2024bba385668764c6e5bd26..050de2e95581cfa91b0ad4569c3508592ef96e36 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -2,8 +2,8 @@
   - mkdir -pv build
   - cd build
   - cmake -DCMAKE_BUILD_TYPE=release -DBUILD_DEMOS=ON -DBUILD_TESTS=ON ..
-  - make -j$(nproc)
-  - ctest -j$(nproc)
+  - make -j$WOLF_N_PROC
+  - ctest -j$WOLF_N_PROC
   # run demos
   - ../bin/hello_wolf
   - ../bin/hello_wolf_autoconf