diff --git a/atlas/helpers.py b/atlas/helpers.py
index 24364b0c..13de56da 100644
--- a/atlas/helpers.py
+++ b/atlas/helpers.py
@@ -6,7 +6,7 @@ def get_cases_available_to_user(user, collection=None):
 
     if collection is not None:
         queryset = queryset | collection.cases.all()
-    return queryset.order_by("pk")
+    return queryset.order_by("pk").distinct()
     if user.is_superuser:
         return Case.objects.all()
     else: