diff --git a/.github/workflows/ci_tests.yml b/.github/workflows/ci_tests.yml
index 4072d37..04b82b7 100644
--- a/.github/workflows/ci_tests.yml
+++ b/.github/workflows/ci_tests.yml
@@ -35,11 +35,12 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - name: Create CMake cache
+        shell: bash
         env:
           CC: ${{ matrix.config.cc }}
           CXX: ${{ matrix.config.cxx }}
         run: |
-          cmake -S . -B cmake-build -DCMAKE_CXX_COMPILER={CXX} -DCMAKE_C_COMPILER={CC}
+          cmake -S . -B cmake-build -DCMAKE_CXX_COMPILER=$CXX -DCMAKE_C_COMPILER=$CC
 
       - name: Build main target
         run: |