diff --git a/beacon-chain/sync/service.go b/beacon-chain/sync/service.go
index 08e20e2e9142..9736fc9b994e 100644
--- a/beacon-chain/sync/service.go
+++ b/beacon-chain/sync/service.go
@@ -53,7 +53,7 @@ const rangeLimit uint64 = 1024
 const seenBlockSize = 1000
 const seenBlobSize = seenBlockSize * 4 // Each block can have max 4 blobs. Worst case 164kB for cache.
 const seenUnaggregatedAttSize = 20000
-const seenAggregatedAttSize = 1024
+const seenAggregatedAttSize = 16384
 const seenSyncMsgSize = 1000         // Maximum of 512 sync committee members, 1000 is a safe amount.
 const seenSyncContributionSize = 512 // Maximum of SYNC_COMMITTEE_SIZE as specified by the spec.
 const seenExitSize = 100