diff --git a/CHANGELOG.md b/CHANGELOG.md
index 17466b59..6628d967 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Changed
+- Use `cartIndex` to correctly update items quantity on cart.
 
 ## [2.14.3] - 2019-03-28
 ### Fixed
diff --git a/react/components/ProductQuantityStepper.js b/react/components/ProductQuantityStepper.js
index 06a9bb0d..1f47574a 100644
--- a/react/components/ProductQuantityStepper.js
+++ b/react/components/ProductQuantityStepper.js
@@ -66,6 +66,7 @@ class ProductQuantityStepper extends Component {
     const {
       sku: { itemId: id },
       seller = {},
+      cartIndex,
     } = product
     try {
       await updateItems([
@@ -73,6 +74,7 @@ class ProductQuantityStepper extends Component {
           id,
           quantity,
           seller: seller.sellerId,
+          index: cartIndex,
         },
       ])
     } catch (err) {