diff --git a/src/modules/mixpanel/mixpanel.controller.ts b/src/modules/mixpanel/mixpanel.controller.ts
index db2ca76..08e1cd4 100644
--- a/src/modules/mixpanel/mixpanel.controller.ts
+++ b/src/modules/mixpanel/mixpanel.controller.ts
@@ -42,7 +42,7 @@ export class MixpanelController {
     username = username.split('+')?.[0];
 
     let firstName = username.substring(0, username.indexOf(separator));
-    let lastName = username.substring(username.lastIndexOf('.') + 1);
+    let lastName = username.substring(username.lastIndexOf(separator) + 1);
 
     if (!firstName) {
       firstName = lastName;