diff --git a/.github/workflows/autobuild.yml b/.github/workflows/autobuild.yml
index fde78fd5..6f71f79c 100644
--- a/.github/workflows/autobuild.yml
+++ b/.github/workflows/autobuild.yml
@@ -357,7 +357,7 @@ jobs:
       - name: Build phase 2
         shell: msys2 {0}
         run: |
-          runner_temp="$(python -c 'r"${{ runner.temp }}".replace("\\", "/")')"
+          runner_temp="$(cygpath "$(python -c 'print(r"${{ runner.temp }}")')")"
           mkdir "$runner_temp"/retro-phase2
           cp retro/core.info "$runner_temp"/retro-phase2/libretro-mkxp-z.info
           meson setup build -Dretro=true -Dretro_phase1_path=retro/build/retro-phase1