diff --git a/src/main/kotlin/com/ecwid/apiclient/v3/dto/cart/request/OrderForCalculate.kt b/src/main/kotlin/com/ecwid/apiclient/v3/dto/cart/request/OrderForCalculate.kt
index f2ec8eb1..2d0253ee 100644
--- a/src/main/kotlin/com/ecwid/apiclient/v3/dto/cart/request/OrderForCalculate.kt
+++ b/src/main/kotlin/com/ecwid/apiclient/v3/dto/cart/request/OrderForCalculate.kt
@@ -73,7 +73,7 @@ data class OrderForCalculate(
 	)
 
 	data class OrderItem(
-		val id: Int? = null,
+		val id: Long? = null,
 
 		val productId: Int? = null,
 		val categoryId: Int? = null,
diff --git a/src/main/kotlin/com/ecwid/apiclient/v3/dto/cart/result/CalculateOrderDetailsResult.kt b/src/main/kotlin/com/ecwid/apiclient/v3/dto/cart/result/CalculateOrderDetailsResult.kt
index cc2213be..6b933bc1 100644
--- a/src/main/kotlin/com/ecwid/apiclient/v3/dto/cart/result/CalculateOrderDetailsResult.kt
+++ b/src/main/kotlin/com/ecwid/apiclient/v3/dto/cart/result/CalculateOrderDetailsResult.kt
@@ -131,7 +131,7 @@ data class CalculateOrderDetailsResult(
 	)
 
 	data class OrderItem(
-		val id: Int? = null,
+		val id: Long? = null,
 
 		val productId: Int? = null,
 		val categoryId: Int? = null,
diff --git a/src/test/kotlin/com/ecwid/apiclient/v3/entity/CartsTest.kt b/src/test/kotlin/com/ecwid/apiclient/v3/entity/CartsTest.kt
index 7689e57d..e5d5838f 100644
--- a/src/test/kotlin/com/ecwid/apiclient/v3/entity/CartsTest.kt
+++ b/src/test/kotlin/com/ecwid/apiclient/v3/entity/CartsTest.kt
@@ -477,7 +477,7 @@ class CartsTest : BaseEntityTest() {
 
 	private fun generateTestItem(): OrderForCalculate.OrderItem {
 		return OrderForCalculate.OrderItem(
-			id = randomId(),
+			id = randomId().toLong(),
 			productId = randomId(),
 			categoryId = randomId(),
 			price = 22.2,