diff --git a/index.d.ts b/index.d.ts
index dfd19ff..bfec422 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -9,7 +9,7 @@ export declare class Pass {
 	public headerFields: Schema.Field[];
 	public primaryFields: Schema.Field[];
 	public secondaryFields: Schema.Field[];
-	public auxiliaryFields: (Schema.Field & { row: number })[];
+	public auxiliaryFields: (Schema.Field & { row?: number })[];
 	public backFields: Schema.Field[];
 
 	/**
diff --git a/src/schema.ts b/src/schema.ts
index d8ec67d..f395c3c 100644
--- a/src/schema.ts
+++ b/src/schema.ts
@@ -327,7 +327,6 @@ export interface Field {
 	timeStyle?: string;
 	currencyCode?: string;
 	numberStyle?: string;
-	row?: number;
 }
 
 const field = Joi.object().keys({
@@ -387,7 +386,7 @@ const locationsDict = Joi.object().keys({
 });
 
 export interface PassFields {
-	auxiliaryFields: Field[];
+	auxiliaryFields: (Field & { row?: number })[];
 	backFields: Field[];
 	headerFields: Field[];
 	primaryFields: Field[];