diff --git a/.github/workflows/cmake-all.yml b/.github/workflows/cmake-all.yml
index f7297a6e9b9..bfe53b55a0f 100644
--- a/.github/workflows/cmake-all.yml
+++ b/.github/workflows/cmake-all.yml
@@ -14,4 +14,4 @@ jobs:
     - name: install dependencies
       run: sudo apt-get install -y libboost-dev libboost-program-options-dev libmpfr-dev libeigen3-dev
     - name: configure all
-      run: mkdir build && cd build && cmake -DWITH_examples=ON -DWITH_tests=ON -DWITH_demos=ON ..
+      run: mkdir build && cd build && CXX=clang++ cmake -DWITH_examples=ON -DWITH_tests=ON -DWITH_demos=ON ..