diff --git a/integrations/pinterest-tag/lib/index.js b/integrations/pinterest-tag/lib/index.js
index aaebee2fb..109b45970 100644
--- a/integrations/pinterest-tag/lib/index.js
+++ b/integrations/pinterest-tag/lib/index.js
@@ -117,7 +117,8 @@ Pinterest.prototype.createPropertyMapping = function() {
     order_id: 'order_id',
     coupon: 'coupon',
     value: 'value',
-    currency: 'currency'
+    currency: 'currency',
+    messageId: 'event_id'
   };
 
   // This is a second map to allow us to loop over specific potentially-nested properties.