diff --git a/beacon/blsync/engineapi.go b/beacon/blsync/engineapi.go
index 10044ab6fb..491f044e8c 100644
--- a/beacon/blsync/engineapi.go
+++ b/beacon/blsync/engineapi.go
@@ -98,7 +98,8 @@ func (ec *engineClient) callNewPayload(fork string, event types.ChainHeadEvent)
 	return resp.Status, err
 }
 
-func collectBlobHashes(b *ctypes.Block) (list []common.Hash) {
+func collectBlobHashes(b *ctypes.Block) []common.Hash {
+	list := make([]common.Hash, 0)
 	for _, tx := range b.Transactions() {
 		for _, h := range tx.BlobHashes() {
 			list = append(list, h)