diff --git a/backend/chat/views.py b/backend/chat/views.py
index b806031..1be5eeb 100644
--- a/backend/chat/views.py
+++ b/backend/chat/views.py
@@ -119,12 +119,12 @@ class ProductChatView(APIView):
         paginated_messages = paginator.paginate_queryset(formatted_messages, request)
         return paginator.get_paginated_response(paginated_messages)
 
-    def post(self, request, pk):
+    def post(self, request, slug):
         """
         Send a new message in the product chat.
         """
         user = request.user
-        product = get_object_or_404(ProductModel, id=pk)
+        product = get_object_or_404(ProductModel, slug=slug)
         chat, created = ProductChatModel.objects.get_or_create(user=user, product=product)
 
         if created: