diff --git a/.github/workflows/build_cython.yml b/.github/workflows/build_cython.yml
index 495a8cbc..68ecbb11 100644
--- a/.github/workflows/build_cython.yml
+++ b/.github/workflows/build_cython.yml
@@ -41,18 +41,17 @@ jobs:
         python -m pip install cython numpy setuptools wheel
 
     - name: Build Cython extensions
-      shell: ${{ matrix.os == 'windows-latest' && 'pwsh' || 'bash' }}
+      shell: bash  # Simplified - bash works on all platforms in GitHub Actions
       env:
         ARCHFLAGS: ${{ matrix.target == 'intel' && '-arch x86_64' || '' }}
       run: |
-        ${{ matrix.os != 'windows-latest' && format(
-        'if [ "{0}" == "macos-latest" ] && [ "{1}" == "intel" ]; then
+        if [ "${{ matrix.os }}" == "macos-latest" ] && [ "${{ matrix.target }}" == "intel" ]; then
           PYTHON_CROSSENV=$(pwd)/crossenv
           python -m pip install crossenv
           python -m crossenv $(which python3) $PYTHON_CROSSENV
           source $PYTHON_CROSSENV/bin/activate
           python -m pip install cython numpy setuptools wheel
-        fi', matrix.os, matrix.target) || '' }}
+        fi
         python cy_setup.py build_ext --inplace
 
     - name: Rename compiled extensions