diff --git a/api/types.go b/api/types.go
index d644dd3d..8e539992 100644
--- a/api/types.go
+++ b/api/types.go
@@ -295,7 +295,7 @@ type Blocks struct {
 type Block struct {
 	Paging
 	bchain.BlockInfo
-	TxCount      int   `json:"TxCount"`
+	TxCount      int   `json:"txCount"`
 	Transactions []*Tx `json:"txs,omitempty"`
 }