diff --git a/script/common/parainstall.sh b/script/common/parainstall.sh
index 0dfdc79..0324674 100644
--- a/script/common/parainstall.sh
+++ b/script/common/parainstall.sh
@@ -12,7 +12,7 @@ function parainstall() {
 		sleep 1 # 1sec.
 
 		# Check if installer still exist
-		if ! ps $installer_pid  > /dev/null ; then	# If not exists
+		if ! ps $INSTALLER_PID  > /dev/null ; then	# If not exists
 			cat <<-HEREDOC 1>&2
 			The installer terminated unexpectedly. 
 
diff --git a/script/void-kaiten-yaki.sh b/script/void-kaiten-yaki.sh
index 678a2eb..50702e4 100644
--- a/script/void-kaiten-yaki.sh
+++ b/script/void-kaiten-yaki.sh
@@ -91,7 +91,7 @@ function main() {
 	fg
 
 	# Record the PID of the installer. 
-	installer_pid=$!
+	export INSTALLER_PID=$!
 
 	# Common part of the para-install. 
 	# Record the install PID, modify the /etc/default/grub of the target,