diff --git a/.github/workflows/macos_build_test.yml b/.github/workflows/macos_build_test.yml
index fc09b2585e..b59f8140f0 100644
--- a/.github/workflows/macos_build_test.yml
+++ b/.github/workflows/macos_build_test.yml
@@ -87,6 +87,9 @@ jobs:
             websockets \
             pprintpp \
             pip
+          export CC=$CONDA_PREFIX/bin/clang
+          export CXX=$CONDA_PREFIX/bin/clang++
+          export CPP=$CONDA_PREFIX/bin/clang-cpp
           mkdir -p $(python3 -m site --user-site)
           python3 install.py -j 3 --allow-milps ${SLOW_FLAG}
           export PATH=$HOME/.local/bin:$PATH