diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 73caa26b8ec2fac8fb39eb28c065556ef2633d8e..e849887edc74a8bb5312438704c21c0a6622867d 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -86,7 +86,7 @@ variables:
     - mkdir build
     - cd build
     - cmake ${CMAKE_ARGS} ${CMAKE_EXTRA_FLAGS} ..
-    - cmake --build . #-- -j
+    - cmake --build . -- -j2 # using too many threads will cause weird compilation errors on the Ubuntu docker images...
     - cmake --build . -- install
   artifacts:
     paths: