diff --git a/netbox/tenancy/filtersets.py b/netbox/tenancy/filtersets.py
index 2e84f3ffe..39e278cf5 100644
--- a/netbox/tenancy/filtersets.py
+++ b/netbox/tenancy/filtersets.py
@@ -111,7 +111,8 @@ class ContactAssignmentFilterSet(NetBoxModelFilterSet):
     )
     group = TreeNodeMultipleChoiceFilter(
         queryset=ContactGroup.objects.all(),
-        field_name='contact__groups__slug',
+        field_name='contact__groups',
+        lookup_expr='in',
         to_field_name='slug',
         label=_('Contact group (slug)'),
     )