diff --git a/specs/phase0/p2p-interface.md b/specs/phase0/p2p-interface.md
index 0f70180e2..6acefb9ad 100644
--- a/specs/phase0/p2p-interface.md
+++ b/specs/phase0/p2p-interface.md
@@ -337,7 +337,7 @@ The following validations MUST pass before forwarding the `signed_aggregate_and_
   (a client MAY queue aggregates for processing once block is retrieved).
 - _[REJECT]_ The block being voted for (`aggregate.data.beacon_block_root`) passes validation.
 - _[REJECT]_ The current `finalized_checkpoint` is an ancestor of the `block` defined by `aggregate.data.beacon_block_root` -- i.e.
-  `get_ancestor(store, hash_tree_root(block), compute_start_slot_at_epoch(store.finalized_checkpoint.epoch))
+  `get_ancestor(store, aggregate.data.beacon_block_root, compute_start_slot_at_epoch(store.finalized_checkpoint.epoch))
   == store.finalized_checkpoint.root`
 
 
@@ -401,7 +401,7 @@ The following validations MUST pass before forwarding the `attestation` on the s
   (a client MAY queue aggregates for processing once block is retrieved).
 - _[REJECT]_ The block being voted for (`attestation.data.beacon_block_root`) passes validation.
 - _[REJECT]_ The current `finalized_checkpoint` is an ancestor of the `block` defined by `attestation.data.beacon_block_root` -- i.e.
-  `get_ancestor(store, hash_tree_root(block), compute_start_slot_at_epoch(store.finalized_checkpoint.epoch))
+  `get_ancestor(store, attestation.data.beacon_block_root, compute_start_slot_at_epoch(store.finalized_checkpoint.epoch))
   == store.finalized_checkpoint.root`