diff --git a/setup.sh b/setup.sh
index 5ec2e97..6db8018 100644
--- a/setup.sh
+++ b/setup.sh
@@ -858,7 +858,7 @@ function set_new_uefi_boot_entries () {
 }
 
 function umount_all () {
-    #3.10
+    #3.9
     if [[ "${part_schema}" = 'mbr' ]]; then
         umount '/mnt/boot/syslinux'
     else
@@ -879,7 +879,7 @@ function finalize_os_setup () {
     if [[ "${part_schema}" = 'gpt' ]]; then
         set_new_uefi_boot_entries               #3.8
     fi
-    umount_all                                  #3.10
+    umount_all                                  #3.9
 }
 
 function main () {