diff --git a/api/core/workflow/nodes/question_classifier/question_classifier_node.py b/api/core/workflow/nodes/question_classifier/question_classifier_node.py
index 15012fa48..3e4984ecd 100644
--- a/api/core/workflow/nodes/question_classifier/question_classifier_node.py
+++ b/api/core/workflow/nodes/question_classifier/question_classifier_node.py
@@ -385,9 +385,8 @@ class QuestionClassifierNode(BaseNode):
                 text=QUESTION_CLASSIFIER_COMPLETION_PROMPT.format(
                     histories=memory_str,
                     input_text=input_text,
-                    categories=json.dumps(categories),
+                    categories=json.dumps(categories, ensure_ascii=False),
                     classification_instructions=instruction,
-                    ensure_ascii=False,
                 )
             )