diff --git a/tests/nix.json b/tests/nix.json
index 115cd6b67..2f207245f 100644
--- a/tests/nix.json
+++ b/tests/nix.json
@@ -1,7 +1,7 @@
 {
     "partition": {
         "device": "/dev/loop0",
-        "mode": "Auto",
+        "mode": "EraseDisk",
         "encrypt_check": false,
         "efi": false,
         "swap": false,