diff --git a/polygon/heimdall/checkpoint.go b/polygon/heimdall/checkpoint.go
index a1d7a763c54..b26d5697866 100644
--- a/polygon/heimdall/checkpoint.go
+++ b/polygon/heimdall/checkpoint.go
@@ -62,7 +62,7 @@ func (c *Checkpoint) MarshalJSON() ([]byte, error) {
 		Proposer   libcommon.Address `json:"proposer"`
 		StartBlock *big.Int          `json:"start_block"`
 		EndBlock   *big.Int          `json:"end_block"`
-		RootHash   libcommon.Hash    `json:"hash"`
+		RootHash   libcommon.Hash    `json:"root_hash"`
 		ChainID    string            `json:"bor_chain_id"`
 		Timestamp  uint64            `json:"timestamp"`
 	}{
@@ -79,7 +79,7 @@ func (c *Checkpoint) MarshalJSON() ([]byte, error) {
 func (c *Checkpoint) UnmarshalJSON(b []byte) error {
 	dto := struct {
 		WaypointFields
-		RootHash libcommon.Hash `json:"hash"`
+		RootHash libcommon.Hash `json:"root_hash"`
 		Id       CheckpointId   `json:"id"`
 	}{}