diff --git a/apps/mtm/filters.py b/apps/mtm/filters.py
index 7f753bdc..8f718a4c 100644
--- a/apps/mtm/filters.py
+++ b/apps/mtm/filters.py
@@ -49,5 +49,6 @@ class RouteFilter(filters.FilterSet):
             "is_autotask": ["exact"],
             "mgroup": ["exact", "in", "isnull"],
             "mgroup__name": ["exact", "contains"],
+            "mgroup__belong_dept": ["exact"],
             "mgroup__belong_dept__name": ["exact", "contains"]
         }