diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1eb39aa..b654921 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,11 +6,12 @@ Record of the modification in project development.
 ### Added
 ### Changed
 - [Issue 5 : OVERWRITEINSTALL confirmation is missing](https://github.com/suikan4github/kaiten-yaki/issues/5)
+- [Issue 6 : Remove loglevel dependency from the void-kaiten-yaki.sh ](https://github.com/suikan4github/kaiten-yaki/6)
 
 ### Deprecated
 ### Removed
 ### Fixed
-### Security
+
 ### Known Issue
 
 ## [1.0.0] - 2021-07-03
diff --git a/script/void-kaiten-yaki.sh b/script/void-kaiten-yaki.sh
index d2c1332..6dd8da4 100644
--- a/script/void-kaiten-yaki.sh
+++ b/script/void-kaiten-yaki.sh
@@ -50,14 +50,14 @@ function main() {
 	else
 		# Not yet. Let's add.
 		echo "...Modify /etc/default/grub."
-		sed -i "s#loglevel=4#loglevel=4 ${GRUB_ADDITIONAL_PARAMETERS}#" /etc/default/grub
-
+		sed -i -e  "/GRUB_CMDLINE_LINUX_DEFAULT/{s#\"#  ${GRUB_ADDITIONAL_PARAMETERS}\"#2}"  /etc/default/grub
 	fi
 
 	# Common part of the pre-install stage
 	if ! pre_install ; then
+		# If error, restore the modification.
 		echo "...restoring modified /etc/default/grub."
-		sed -i "s#loglevel=4 ${GRUB_ADDITIONAL_PARAMETERS}#loglevel=4#" /etc/default/grub
+		sed -i -e "s#loglevel=4 ${GRUB_ADDITIONAL_PARAMETERS}#loglevel=4#" /etc/default/grub
 		return 1 # with error status
 	fi