diff --git a/src/backend/chat/views.py b/src/backend/chat/views.py
index 3014999..492f789 100644
--- a/src/backend/chat/views.py
+++ b/src/backend/chat/views.py
@@ -425,7 +425,7 @@ class ChatConversationAttachmentViewSet(
         if settings.POSTHOG_KEY:
             posthog.capture(
                 "item_uploaded",
-                distinct_id=request.user.email,
+                distinct_id=request.user.id,
                 properties={
                     "id": attachment.pk,
                     "file_name": attachment.file_name,