diff --git a/resources/cleanup.sh b/resources/cleanup.sh
index d16ff04..77c516f 100755
--- a/resources/cleanup.sh
+++ b/resources/cleanup.sh
@@ -3,6 +3,7 @@
 set -exu
 
 cleanup() {
+  umount /mnt
   pkg clean -a -y
   sed -i '' 's/signature_type: "none"/signature_type: "fingerprints"/' /etc/pkg/FreeBSD.conf
 }