diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index bc04ced..e7758e1 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -20,6 +20,6 @@ jobs:
     - name: Build and test
       env:
         CXX: ${{ matrix.compiler }}
-        COMPILERFLAGS: ${{ matrix.flags }} ${{ matrix.optimize }}
+        CXXFLAGS: ${{ matrix.flags }} ${{ matrix.optimize }}
       run: |
-        mkdir build && cd build && cmake -DPHMAP_BUILD_TESTS=ON -DPHMAP_BUILD_EXAMPLES=ON -DCMAKE_CXX_COMPILER=${CXX} -DCXXFLAGS="${COMPILERFLAGS}"  -DCMAKE_VERBOSE_MAKEFILE:BOOL=ON .. && cmake --build . && make test
+        mkdir build && cd build && cmake -DPHMAP_BUILD_TESTS=ON -DPHMAP_BUILD_EXAMPLES=ON -DCMAKE_VERBOSE_MAKEFILE:BOOL=ON .. && cmake --build . && make test