diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index fe18cf698e57f5f7718d919117fe351030605e15..a67b74a1abbc8a2194b0f869b66351f2347b8ca0 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -49,8 +49,8 @@
   - mkdir -pv build
   - cd build
   - cmake -DCMAKE_BUILD_TYPE=release -DBUILD_EXAMPLES=ON -DBUILD_TESTS=ON ..
-  - make -j$(nproc)
-  - ctest -j$(nproc)
+  - make -j2
+  - ctest -j2
   - make install
   - cd ../..
 
@@ -58,8 +58,8 @@
   - mkdir -pv build
   - cd build
   - cmake -DCMAKE_BUILD_TYPE=release -DBUILD_EXAMPLES=ON -DBUILD_TESTS=ON ..
-  - make -j$(nproc)
-  - ctest -j$(nproc)
+  - make -j2
+  - ctest -j2
   - make install
 
 ############ UBUNTU 16.04 TESTS ############