diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ee7a5b3aa88..24bad844281 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -679,7 +679,7 @@ jobs:
             -DVORTEX_SANITIZE_RUST_STD=ON \
             -DVORTEX_BUILD_TESTS=ON \
             -DVORTEX_BUILD_EXAMPLES=ON
-          cmake --build build --parallel "$(nproc)"
+          cmake --build build --parallel 2
       - name: Run C++ tests
         run: ctest --test-dir build --output-on-failure
       - name: Run C++ examples