diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index f6b3d4d..e14e8e5 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -18,6 +18,6 @@ jobs:
       uses: actions/checkout@v2.0.0
     - name: Build and test
       env:
-        CC: ${{ matrix.compiler }}
+        CXX: ${{ matrix.compiler }}
       run: |
         mkdir build && cd build && cmake -DPHMAP_BUILD_TESTS=ON -DPHMAP_BUILD_EXAMPLES=ON -DCMAKE_CXX_COMPILER=${COMPILER} -DCXXFLAGS="${CXX_FLAGS}" .. && cmake --build . && make test