diff --git a/integrations/klaviyo/lib/index.js b/integrations/klaviyo/lib/index.js
index 262dd9221..33b60bb21 100644
--- a/integrations/klaviyo/lib/index.js
+++ b/integrations/klaviyo/lib/index.js
@@ -217,7 +217,8 @@ function formatItems(track) {
         ProductCategories: [product.category()],
         ProductURL: product.proxy('properties.productUrl'),
         ImageURL: product.proxy('properties.imageUrl'),
-        SKU: product.sku()
+        SKU: product.sku(),
+        ProductID: product.productId() || product.id()
       });
 
       // ensure unique $event_id is associated with each Ordered Product event by combining Order Completed
diff --git a/integrations/klaviyo/test/index.test.js b/integrations/klaviyo/test/index.test.js
index 72c21607a..c51239fcc 100644
--- a/integrations/klaviyo/test/index.test.js
+++ b/integrations/klaviyo/test/index.test.js
@@ -322,12 +322,13 @@ describe('Klaviyo', function() {
             ProductCategories: ['Games'],
             ProductURL: 'http://www.example.com/path/to/product',
             ImageURL: 'http://www.example.com/path/to/product/image.png',
-            SKU: '45790-32'
+            SKU: '45790-32',
+            ProductID: '507f1f77bcf86cd799439011'
           }
         ]);
       });
 
-      it('should have the correct $event_id for Ordered Product if id passed as product_id', function() {
+      it('should have correct $event_id for Ordered Product if id passed as product_id', function() {
         analytics.track('Completed Order', {
           order_id: '50314b8e9bcf000000000000',
           total: 30,
@@ -362,7 +363,8 @@ describe('Klaviyo', function() {
             ProductCategories: ['Games'],
             ProductURL: 'http://www.example.com/path/to/product',
             ImageURL: 'http://www.example.com/path/to/product/image.png',
-            SKU: '45790-32'
+            SKU: '45790-32',
+            ProductID: '507f1f77bcf86cd799439011'
           }
         ]);
       });