diff --git a/.github/workflows/build-coop.yaml b/.github/workflows/build-coop.yaml
index 1d1f376fc..63a2bd97d 100644
--- a/.github/workflows/build-coop.yaml
+++ b/.github/workflows/build-coop.yaml
@@ -37,7 +37,7 @@ jobs:
         runs-on: windows-latest
         defaults:
             run:
-                shell: msys2 {0}
+                shell: set MSYSTEM=MINGW64 msys2 {0}
         steps:
             - name: Checkout repository
               uses: actions/checkout@v4