diff --git a/build-ext.sh b/build-ext.sh
index 121accc..58bf063 100755
--- a/build-ext.sh
+++ b/build-ext.sh
@@ -3,7 +3,14 @@
 set -e
 git clone --depth=1 https://github.com/chenall/grubutils.git $GITHUB_WORKSPACE/grubutils
 pushd $GITHUB_WORKSPACE/grubutils
-make -C umbr
-make -j -C g4dext && mv g4dext/bin g4dext/ext
-make -j -C g4eext && mv g4eext/bin g4eext/ext
+GRUB4DOS_VER=$(cat $GITHUB_WORKSPACE/grub4dos_version)
+if [ "${GRUB4DOS_VER/EFI}" = "${GRUB4DOS_VER}" ]; then
+  sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.8 100
+  make -C umbr
+  make -j -C g4dext && mv g4dext/bin g4dext/ext
+  make -C g4dext clean
+else
+  make -j -C g4eext && mv g4eext/bin g4eext/ext
+  make -C g4eext clean
+fi
 popd