diff --git a/.github/workflows/reusable-windows-msi.yml b/.github/workflows/reusable-windows-msi.yml
index d0d53dba0b45d1..a1c45d954247fb 100644
--- a/.github/workflows/reusable-windows-msi.yml
+++ b/.github/workflows/reusable-windows-msi.yml
@@ -24,4 +24,5 @@ jobs:
       with:
         persist-credentials: false
     - name: Build CPython installer
-      run: .\Tools\msi\build.bat --doc -"${ARCH}"
+      run: ./Tools/msi/build.bat --doc -"${ARCH}"
+      shell: bash