diff --git a/protocols/horizon/main.go b/protocols/horizon/main.go
index dd9cc7814f..df4aee78cf 100644
--- a/protocols/horizon/main.go
+++ b/protocols/horizon/main.go
@@ -582,7 +582,7 @@ type AsyncTransactionSubmissionResponse struct {
 	// ErrorResultXDR is present only if Status is equal to proto.TXStatusError.
 	// ErrorResultXDR is a TransactionResult xdr string which contains details on why
 	// the transaction could not be accepted by stellar-core.
-	ErrorResultXDR string `json:"errorResultXdr,omitempty"`
+	ErrorResultXDR string `json:"error_result_xdr,omitempty"`
 	// TxStatus represents the status of the transaction submission returned by stellar-core.
 	// It can be one of: proto.TXStatusPending, proto.TXStatusDuplicate,
 	// proto.TXStatusTryAgainLater, or proto.TXStatusError.
diff --git a/services/horizon/internal/httpx/static/txsub_async_oapi.yaml b/services/horizon/internal/httpx/static/txsub_async_oapi.yaml
index f889cf4ec8..0e9a23e676 100644
--- a/services/horizon/internal/httpx/static/txsub_async_oapi.yaml
+++ b/services/horizon/internal/httpx/static/txsub_async_oapi.yaml
@@ -52,7 +52,7 @@ paths:
                 ErrorStatusExample:
                   summary: ERROR Status from core
                   value:
-                    errorResultXdr: "AAAAAAAAAGT////7AAAAAA=="
+                    error_result_xdr: "AAAAAAAAAGT////7AAAAAA=="
                     tx_status: "ERROR"
                     hash: "6cbb7f714bd08cea7c30cab7818a35c510cbbfc0a6aa06172a1e94146ecf0165"
         '405':
@@ -78,7 +78,7 @@ paths:
               schema:
                 $ref: '#/components/schemas/AsyncTransactionSubmissionResponse'
               example: 
-                  errorResultXdr: ""
+                  error_result_xdr: ""
                   tx_status: "DUPLICATE"
                   hash: "6cbb7f714bd08cea7c30cab7818a35c510cbbfc0a6aa06172a1e94146ecf0165"
         '500':
@@ -136,7 +136,7 @@ components:
     AsyncTransactionSubmissionResponse:
       type: object
       properties:
-        errorResultXdr:
+        error_result_xdr:
           type: string
           nullable: true
           description: TransactionResult XDR string which is present only if the submission status from core is an ERROR.