diff --git a/awx/api/serializers.py b/awx/api/serializers.py
index 75b2678e73..c3fc603dae 100644
--- a/awx/api/serializers.py
+++ b/awx/api/serializers.py
@@ -2385,14 +2385,14 @@ class JobOptionsSerializer(LabelsListMixin, BaseSerializer):
         try:
             if obj.credential:
                 res['credential'] = self.reverse(
-                    'api:credential_detail', kwargs={'pk': obj.credential.pk}
+                    'api:credential_detail', kwargs={'pk': obj.credential}
                 )
         except ObjectDoesNotExist:
             setattr(obj, 'credential', None)
         try:
             if obj.vault_credential:
                 res['vault_credential'] = self.reverse(
-                    'api:credential_detail', kwargs={'pk': obj.vault_credential.pk}
+                    'api:credential_detail', kwargs={'pk': obj.vault_credential}
                 )
         except ObjectDoesNotExist:
             setattr(obj, 'vault_credential', None)