diff --git a/graphql/graphql.go b/graphql/graphql.go
index 93313d743a9a..49be23af69dd 100644
--- a/graphql/graphql.go
+++ b/graphql/graphql.go
@@ -615,13 +615,13 @@ func (t *Transaction) V(ctx context.Context) hexutil.Big {
 	return hexutil.Big(*v)
 }
 
-func (t *Transaction) YParity(ctx context.Context) (*hexutil.Uint64, error) {
+func (t *Transaction) YParity(ctx context.Context) (*hexutil.Big, error) {
 	tx, _ := t.resolve(ctx)
 	if tx == nil || tx.Type() == types.LegacyTxType {
 		return nil, nil
 	}
 	v, _, _ := tx.RawSignatureValues()
-	ret := hexutil.Uint64(v.Int64())
+	ret := hexutil.Big(*v)
 	return &ret, nil
 }
 
diff --git a/graphql/schema.go b/graphql/schema.go
index 5738923fc170..8264f1c28638 100644
--- a/graphql/schema.go
+++ b/graphql/schema.go
@@ -157,7 +157,7 @@ const schema string = `
         r: BigInt!
         s: BigInt!
         v: BigInt!
-        yParity: Long
+        yParity: BigInt
         # Envelope transaction support
         type: Long
         accessList: [AccessTuple!]