diff --git a/data/api/apiBlock.go b/data/api/apiBlock.go
index 38b777308..85b878be3 100644
--- a/data/api/apiBlock.go
+++ b/data/api/apiBlock.go
@@ -62,8 +62,8 @@ type NotarizedBlock struct {
 
 // EpochStartShardData is a structure that holds data about the epoch start shard data
 type EpochStartShardData struct {
-	ShardID                 uint32       `json:"shardID,omitempty"`
-	Epoch                   uint32       `json:"epoch,omitempty"`
+	ShardID                 uint32       `json:"shard"`
+	Epoch                   uint32       `json:"epoch"`
 	Round                   uint64       `json:"round,omitempty"`
 	Nonce                   uint64       `json:"nonce,omitempty"`
 	HeaderHash              string       `json:"headerHash,omitempty"`