diff --git a/install.sh b/install.sh
index a39daad..b98e410 100755
--- a/install.sh
+++ b/install.sh
@@ -125,7 +125,7 @@ main () {
         touch ${GFU_MOUNT_PATH}/boot/grub/grub.cfg
     fi
 
-    umount -v ${GFU_MOUNT_PATH}1
+    umount -v ${GFU_DEVICE}1
 }
 
 main "${@}"