diff --git a/apps/inm/filters.py b/apps/inm/filters.py
index 42faf892..e4fc930c 100644
--- a/apps/inm/filters.py
+++ b/apps/inm/filters.py
@@ -32,6 +32,7 @@ class MioFilter(filters.FilterSet):
             "order": ["exact"],
             "item_mio__test_date": ["isnull"],
             "item_mio__test_user": ["isnull"],
+            "mgroup": ["exact"],
         }
 
     def filter_materials__type(self, queryset, name, value):