diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index f93f0aed..0f250259 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -658,7 +658,7 @@ jobs:
           GAM_ARCHIVE="../gam-${GAMVERSION}-windows-${GAM_ARCHIVE_ARCH}.zip"
           /c/Program\ Files/7-Zip/7z.exe a -tzip $GAM_ARCHIVE gam7 "-xr@${GITHUB_WORKSPACE}/.github/actions/package_exclusions.txt" -bb3
           cd ..
-          tools/gen-wix-xml-filelist.py "$gampath" gam.wxs.template gam.wxs
+          $PYTHON tools/gen-wix-xml-filelist.py "$gampath" gam.wxs.template gam.wxs
           echo '-- begin generated gam.wxs --'
           cat gam.wxs
           echo '-- end generated gam.wxs --'