diff --git a/awx/api/filters.py b/awx/api/filters.py
index 841acc87cd..238f9c7dcc 100644
--- a/awx/api/filters.py
+++ b/awx/api/filters.py
@@ -276,7 +276,7 @@ class FieldLookupBackend(BaseFilterBackend):
                 # TODO: remove after API v1 deprecation period
                 if queryset.model._meta.object_name in ('JobTemplate', 'Job') and key in (
                         'credential', 'vault_credential', 'cloud_credential', 'network_credential'
-                ):
+                ) or queryset.model._meta.object_name in ('InventorySource', 'InventoryUpdate') and key == 'credential':
                     key = 'credentials'
 
                 # Make legacy v1 Credential fields work for backwards compatability