diff -Naur grub-2.02~rc2/util/grub-mkconfig.in grub-2.02~rc2-busybox/util/grub-mkconfig.in
--- grub-2.02~rc2/util/grub-mkconfig.in	2017-02-11 23:25:13.000000000 +0100
+++ grub-2.02~rc2-busybox/util/grub-mkconfig.in	2017-04-04 11:19:50.246850173 +0200
@@ -144,7 +144,7 @@
 GRUB_FS="`${grub_probe} --device ${GRUB_DEVICE} --target=fs 2> /dev/null || echo unknown`"
 
 if [ x"$GRUB_FS" = xunknown ]; then
-    GRUB_FS="$(stat -f --printf=%T / || echo unknown)"
+    GRUB_FS="$(stat -f -c %T / || echo unknown)"
 fi
 
 if test -f ${sysconfdir}/default/grub ; then