diff --git a/src/helpers.js b/src/helpers.js
index df80657..ba77fd8 100644
--- a/src/helpers.js
+++ b/src/helpers.js
@@ -27,7 +27,7 @@ var helpers = {
                 userId = userIdentities['email'];
                 break;
             case 'mpid':
-                userId = userIdentities['mpid'];
+                userId = window.mParticle.Identity.getCurrentUser().getMPID();
                 break;
             case 'other':
                 userId = userIdentities['other'];