diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index a6d21342..e75502b2 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -19,7 +19,7 @@ build:
     - mkdir build
     - cd build
     - cmake -DCMAKE_BUILD_TYPE=Release ..
-    - make -j($nproc)
+    - make -j$(nproc)
   artifacts:
     untracked: true
     paths: