diff --git a/InvenTree/order/api.py b/InvenTree/order/api.py
index cb451b13df..98b9bbe934 100644
--- a/InvenTree/order/api.py
+++ b/InvenTree/order/api.py
@@ -51,6 +51,7 @@ class POFilter(rest_filters.FilterSet):
         return queryset
 
     class Meta:
+        model = models.PurchaseOrder
         fields = [
             'supplier',
         ]