diff --git a/crates/core/src/backend/lock.rs b/crates/core/src/backend/lock.rs
index 3602eb85..09a426d9 100644
--- a/crates/core/src/backend/lock.rs
+++ b/crates/core/src/backend/lock.rs
@@ -98,7 +98,7 @@ impl WriteBackend for LockBackend {
         let until = until.map_or_else(|| String::new(), |u| format!("{}", u.to_rfc3339()));
         let path = path(tpe, id);
         let args = self.command.args().iter().map(|c| {
-            c.replace("%id", &id.to_string())
+            c.replace("%id", &id.to_hex())
                 .replace("%type", tpe.dirname())
                 .replace("%path", &path)
                 .replace("%until", &until)