diff --git a/tests/util/grub-fs-tester.in b/tests/util/grub-fs-tester.in
index 65633c7f8..868199109 100644
--- a/tests/util/grub-fs-tester.in
+++ b/tests/util/grub-fs-tester.in
@@ -1,6 +1,7 @@
 #!@BUILD_SHEBANG@
 
 set -e
+export BLKID_FILE=/dev/null
 
 fs="$1"