diff --git a/src/ld/mod.rs b/src/ld/mod.rs
index 88dc552..4b618c0 100644
--- a/src/ld/mod.rs
+++ b/src/ld/mod.rs
@@ -49,6 +49,7 @@ pub use cdb::{UNLOCK_MARKER, is_unlock_read_buffer};
 // The MT1959 unlocker. Matches a drive against the bundled profile database and
 // runs the firmware-unlock + disc-speed-calibration handshake over raw SCSI.
 // Stateless: `unlock()` returns what it learned.
+#[derive(Default)]
 pub struct LdUnlocker;
 
 impl LdUnlocker {
diff --git a/src/renesas/mod.rs b/src/renesas/mod.rs
index d41cb24..fa0378c 100644
--- a/src/renesas/mod.rs
+++ b/src/renesas/mod.rs
@@ -62,6 +62,7 @@ pub fn is_renesas(scsi: &mut dyn ScsiTransport) -> std::result::Result<bool, Unl
 /// is what MakeMKV's LibreDrive does on stock Pioneer firmware), so the Volume
 /// ID is then read with the SAME standard `0xAD` reader as freemkv/MT1959 — no
 /// host cert, no AKE. Stateless: `unlock()` returns what it learned.
+#[derive(Default)]
 pub struct Renesas;
 
 impl Renesas {