diff --git a/nixos/tests/private-storage.nix b/nixos/tests/private-storage.nix
index 86c6cbdb08e3f305dc5e1a18907d737d1f8c1c1e..640ee256716649e4e0c491e114667812e6a2c885 100644
--- a/nixos/tests/private-storage.nix
+++ b/nixos/tests/private-storage.nix
@@ -258,7 +258,7 @@ in {
         voucher
       ]}
     except:
-      code, log = client.execute('cat /tmp/stdout /tmp/stderr');
+      code, output = client.execute('cat /tmp/stdout /tmp/stderr');
       client.log(output)
 
       # Dump the fake Stripe API server logs, too, since the error may arise