diff --git a/specs/sharding/beacon-chain.md b/specs/sharding/beacon-chain.md
index fb687e1ca..afa04ba41 100644
--- a/specs/sharding/beacon-chain.md
+++ b/specs/sharding/beacon-chain.md
@@ -671,7 +671,8 @@ def process_pending_headers(state: BeaconState) -> None:
     previous_epoch = get_previous_epoch(state)
     previous_epoch_start_slot = compute_start_slot_at_epoch(previous_epoch)
     for slot in range(previous_epoch_start_slot, previous_epoch_start_slot + SLOTS_PER_EPOCH):
-        for shard in range(get_active_shard_count(state, previous_epoch)):
+        for shard_index in range(get_active_shard_count(state, previous_epoch)):
+            shard = Shard(shard_index)
             # Pending headers for this (slot, shard) combo
             candidates = [
                 c for c in state.previous_epoch_pending_shard_headers
@@ -682,7 +683,7 @@ def process_pending_headers(state: BeaconState) -> None:
                 continue
 
             # The entire committee (and its balance)
-            full_committee = get_beacon_committee(state, slot, shard)
+            full_committee = get_beacon_committee(state, slot, CommitteeIndex(shard))
             # The set of voters who voted for each header (and their total balances)
             voting_sets = [
                 set(v for i, v in enumerate(full_committee) if c.votes[i])