diff --git a/beacon_chain/spec/beaconstate.nim b/beacon_chain/spec/beaconstate.nim
index 991b522cc..235af722a 100644
--- a/beacon_chain/spec/beaconstate.nim
+++ b/beacon_chain/spec/beaconstate.nim
@@ -597,6 +597,7 @@ proc makeAttestationData*(
     crosslink: Crosslink(
       shard: shard,
       parent_root: hash_tree_root(state.current_crosslinks[shard]),
+      start_epoch: state.current_crosslinks[shard].end_epoch,
       end_epoch: target_epoch,
     )
   )