diff --git a/biscuit/apps/alsijil/views.py b/biscuit/apps/alsijil/views.py
index 309338f366372af429175e7a6176e11962f1d8ac..3014aacc5f49136636e7e95fc6dd5f47cc00e767 100644
--- a/biscuit/apps/alsijil/views.py
+++ b/biscuit/apps/alsijil/views.py
@@ -135,7 +135,7 @@ def group_week(request: HttpRequest, week: Optional[int] = None) -> HttpResponse
                 personal_notes__absent=True,
                 personal_notes__excused=False
             )),
-            tardiness=Sum('personal_notes__tardiness', filter=Q(
+            tardiness=Sum('personal_notes__late', filter=Q(
                 personal_notes__week=wanted_week
             ))
         )