diff --git a/tests/util/grub-shell-luks-tester.in b/tests/util/grub-shell-luks-tester.in
index 7cfb60b51..e695b9435 100644
--- a/tests/util/grub-shell-luks-tester.in
+++ b/tests/util/grub-shell-luks-tester.in
@@ -132,6 +132,7 @@ fi
 
 # Make sure that the dm-crypto device is shutdown
 cleanup() {
+    RET=$?
     if [ -e "$luksdev" ]; then
         cryptsetup close "$luksdev"
     fi