diff --git a/crates/ptth_relay/src/key_validity.rs b/crates/ptth_relay/src/key_validity.rs
index 30a314b..8488409 100644
--- a/crates/ptth_relay/src/key_validity.rs
+++ b/crates/ptth_relay/src/key_validity.rs
@@ -80,6 +80,8 @@ pub struct ScraperKey <V: MaxValidDuration> {
 	pub not_before: DateTime <Utc>,
 	pub not_after: DateTime <Utc>,
 	pub hash: BlakeHashWrapper,
+	
+	#[serde (default)]
 	_phantom: std::marker::PhantomData <V>,
 }