diff --git a/util/grub-mkrescue.in b/util/grub-mkrescue.in
index 690bddb..2457f4c 100644
--- a/util/grub-mkrescue.in
+++ b/util/grub-mkrescue.in
@@ -56,6 +56,7 @@ Make GRUB rescue image.
   -v, --version           print the version information and exit
   -o, --output=FILE       save output in FILE [required]
   --modules=MODULES       pre-load specified modules MODULES
+  --configpart=PARTITION  PARTITION containing /boot/grub/grub.cfg [optional]
   --rom-directory=DIR     save rom images in DIR [optional]
   --xorriso=FILE          use FILE as xorriso [optional]
   --grub-mkimage=FILE     use FILE as grub-mkimage
@@ -100,6 +101,9 @@ do
     --modules=*)
 	modules=`echo "$option" | sed 's/--modules=//'` ;;
 
+    --configpart=*)
+	config_part=`echo "$option" | sed 's/--configpart=//'` ;;
+
     -o | --output)
 	output_image=`argument $option "$@"`; shift ;;
     --output=*)
@@ -201,7 +205,7 @@ EOF
     (for i in $(cat ${source_directory}/partmap.lst) ${modules} ; do
         echo "insmod $i"
     done ; \
-    echo "source /boot/grub/grub.cfg") \
+    echo "source ${config_part}/boot/grub/grub.cfg") \
     > ${iso9660_dir}/boot/grub/${platform}/grub.cfg
 
     (cd "${memdisk_dir}"; tar -cf - boot) > "${memdisk_img}"
@@ -268,7 +272,7 @@ if test -e "${pc_dir}" ; then
     (for i in $(cat ${pc_dir}/partmap.lst) ${modules} ; do
         echo "insmod $i"
     done ; \
-    echo "source /boot/grub/grub.cfg") \
+    echo "source ${config_part}/boot/grub/grub.cfg") \
     > ${iso9660_dir}/boot/grub/i386-pc/grub.cfg
 
     grub_mkisofs_arguments="${grub_mkisofs_arguments} -b boot/grub/i386-pc/eltorito.img -no-emul-boot -boot-info-table \