diff --git a/.github/workflows/ci-windows.yml b/.github/workflows/ci-windows.yml
index d0258d925..38048b151 100644
--- a/.github/workflows/ci-windows.yml
+++ b/.github/workflows/ci-windows.yml
@@ -13,6 +13,7 @@ on:
 
 env:
   ALIRE_OS:     windows
+  MSYS64_ROOT:  C:\Users\runneradmin\AppData\Local\alire\cache\msys64
   MINGW64_PATH: C:\Users\runneradmin\AppData\Local\alire\cache\msys64\mingw64\bin
   MSYS2_PATH:   C:\Users\runneradmin\AppData\Local\alire\cache\msys64\usr\bin
   PACMAN:       C:\Users\runneradmin\AppData\Local\alire\cache\msys64\usr\bin\pacman --noconfirm
@@ -38,6 +39,9 @@ jobs:
     - name: Build alr
       run: gprbuild -j0 -p -P alr_env
 
+    - name: Remove previous alr's msys2 (so a new one can be tested)
+      run: rmdir /s /q ${{env.MSYS64_ROOT}}
+
     - name: Display built alr and trigger install of msys2
       run: ./bin/alr version