diff --git a/lib/util-iso-mount.sh b/lib/util-iso-mount.sh
index 3d35c3e..dcec18f 100644
--- a/lib/util-iso-mount.sh
+++ b/lib/util-iso-mount.sh
@@ -63,8 +63,8 @@ umount_fs(){
     if [[ -n ${FS_ACTIVE_MOUNTS[@]} ]]; then
         #info "overlayfs umount: [%s]" "${FS_ACTIVE_MOUNTS[@]}"
         #umount "${FS_ACTIVE_MOUNTS[@]}"
-        info "overlayfs umount: [%s]" "$(grep \"${work_dir}\" /proc/mounts | awk '{print$2}' | sort -r)"
-        umount -l "$(grep \"${work_dir}\" /proc/mounts | awk '{print$2}' | sort -r)"
+        info "overlayfs umount: [%s]" "$(${FS_ACTIVE_MOUNTS[@]} | sort -r)"
+        umount "$(${FS_ACTIVE_MOUNTS[@]} | sort -r)"
         unset FS_ACTIVE_MOUNTS
         rm -rf "${mnt_dir}/work"
     fi