diff --git a/awx/main/tests/unit/api/serializers/test_workflow_serializers.py b/awx/main/tests/unit/api/serializers/test_workflow_serializers.py
index b444531206..b8697db71f 100644
--- a/awx/main/tests/unit/api/serializers/test_workflow_serializers.py
+++ b/awx/main/tests/unit/api/serializers/test_workflow_serializers.py
@@ -125,6 +125,7 @@ class TestWorkflowJobTemplateNodeSerializerCharPrompts():
         serializer = WorkflowJobTemplateNodeSerializer()
         node = WorkflowJobTemplateNode(pk=1)
         node.char_prompts = {'limit': 'webservers'}
+        serializer.instance = node
         view = FakeView(node)
         view.request = FakeRequest()
         view.request.method = "PATCH"