diff --git a/builds/any/installer/installer.sh.in b/builds/any/installer/installer.sh.in
index 76b33987..e3d968aa 100644
--- a/builds/any/installer/installer.sh.in
+++ b/builds/any/installer/installer.sh.in
@@ -528,7 +528,7 @@ installer_force_umount() {
   dev=$1; shift
   mpt=$1; shift
   case "$mpt" in
-    /mnt/*)
+    /mnt/*|/boot/*)
       installer_say "Unmounting $mpt (--force)"
       umount "$mpt"
       ;;