diff --git a/.github/workflows/test-windows.yml b/.github/workflows/test-windows.yml
index bbfb00fdb..98b098a0d 100644
--- a/.github/workflows/test-windows.yml
+++ b/.github/workflows/test-windows.yml
@@ -370,6 +370,7 @@ jobs:
         .ci/after_success.sh
       env:
         MATRIX_OS: ${{ matrix.os }}
+      shell: pwsh
 
     - name: Prepare coverage token
       if: success() && github.repository == 'python-pillow/Pillow'