diff --git a/awx/api/filters.py b/awx/api/filters.py
index d9e430ff7f..050534a963 100644
--- a/awx/api/filters.py
+++ b/awx/api/filters.py
@@ -129,7 +129,7 @@ class FieldLookupBackend(BaseFilterBackend):
         elif isinstance(field, models.BooleanField):
             return to_python_boolean(value)
         elif isinstance(field, RelatedObject):
-            return to_python_related(value)
+            return self.to_python_related(value)
         else:
             return field.to_python(value)