diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d6914628c..f0af502d8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -245,6 +245,7 @@ jobs:
       working-directory: ${{runner.workspace}}/build
       run: >
         cmake $GITHUB_WORKSPACE
+        $BUILD_SYSTEM_FLAG
         -DCMAKE_BUILD_TYPE=$BUILD_TYPE
         $CMAKE_FLAGS
         -DSPIRIT_USE_OPENMP=ON