diff --git a/beacon_node/store/src/errors.rs b/beacon_node/store/src/errors.rs
index 8a0b44197a..6a22c888a7 100644
--- a/beacon_node/store/src/errors.rs
+++ b/beacon_node/store/src/errors.rs
@@ -19,6 +19,8 @@ pub enum Error {
     },
     RlpError(String),
     BlockNotFound(Hash256),
+    /// The blobs sidecar mapping to this block root is older than the data availability boundary.
+    BlobsTooOld(Hash256),
     NoContinuationData,
     SplitPointModified(Slot, Slot),
     ConfigError(StoreConfigError),