diff --git a/api/core/workflow/nodes/knowledge_retrieval/knowledge_retrieval_node.py b/api/core/workflow/nodes/knowledge_retrieval/knowledge_retrieval_node.py
index 4ec033572c..66be95cdd9 100644
--- a/api/core/workflow/nodes/knowledge_retrieval/knowledge_retrieval_node.py
+++ b/api/core/workflow/nodes/knowledge_retrieval/knowledge_retrieval_node.py
@@ -507,7 +507,7 @@ class KnowledgeRetrievalNode(LLMNode):
                 filters.append(sqlalchemy_cast(Document.doc_metadata[metadata_name].astext, Integer) < value)
             case "after" | ">":
                 filters.append(sqlalchemy_cast(Document.doc_metadata[metadata_name].astext, Integer) > value)
-            case "≤" | ">=":
+            case "≤" | "<=":
                 filters.append(sqlalchemy_cast(Document.doc_metadata[metadata_name].astext, Integer) <= value)
             case "≥" | ">=":
                 filters.append(sqlalchemy_cast(Document.doc_metadata[metadata_name].astext, Integer) >= value)