diff --git a/usr/lib/archboot/update-installer/update-installer.sh b/usr/lib/archboot/update-installer/update-installer.sh
index 3472333e3..3c465802a 100644
--- a/usr/lib/archboot/update-installer/update-installer.sh
+++ b/usr/lib/archboot/update-installer/update-installer.sh
@@ -241,8 +241,8 @@ _create_initramfs() {
     # compress image with zstd
     cd  "${_W_DIR}"/tmp || exit 1
     find . -mindepth 1 -printf '%P\0' | sort -z |
-    bsdtar --null -cnf - -T - |
-    bsdtar --null -cf - --format=newc @- | zstd --rm -T0> ${_RAM}/${_INITRD} &
+    LANG=C bsdtar --null -cnf - -T - |
+    LANG=C bsdtar --null -cf - --format=newc @- | zstd --rm -T0> ${_RAM}/${_INITRD} &
     sleep 2
     while pgrep -x zstd &>/dev/null; do
         _clean_kernel_cache