diff --git a/common b/common
index ced125b..431064c 100644
--- a/common
+++ b/common
@@ -42,8 +42,9 @@ chroot_setup() {
 
 chroot_teardown() {
   if (( ${#CHROOT_ACTIVE_MOUNTS[@]} )); then
-    umount "${CHROOT_ACTIVE_MOUNTS[@]}"
+    umount -l "${CHROOT_ACTIVE_MOUNTS[@]}"
   fi
+
   unset CHROOT_ACTIVE_MOUNTS
 }