diff --git a/lighthouse/state/attestation_record.rs b/lighthouse/state/attestation_record.rs
index fc949b9e6..9fa8fc73a 100644
--- a/lighthouse/state/attestation_record.rs
+++ b/lighthouse/state/attestation_record.rs
@@ -19,7 +19,8 @@ impl Encodable for AttestationRecord {
         s.append_vec(&self.oblique_parent_hashes);
         s.append(&self.shard_block_hash);
         s.append_vec(&self.attester_bitfield.to_be_vec());
-        // TODO: add aggregate signature
+        // TODO: encode the aggregate sig correctly
+        s.append_vec(&vec![0_u8; 64])
     }
 }
 
diff --git a/lighthouse/state/block/block.rs b/lighthouse/state/block/block.rs
index d9c2c0579..bfc2e1b40 100644
--- a/lighthouse/state/block/block.rs
+++ b/lighthouse/state/block/block.rs
@@ -54,6 +54,8 @@ impl Encodable for Block {
         s.append(&self.pow_chain_ref);
         s.append(&self.active_state_root);
         s.append(&self.crystallized_state_root);
+        // TODO: encode the aggregate sig correctly
+        s.append_vec(&vec![0_u8; 64])
     }
 }