diff --git a/api/core/app/workflow/layers/llm_quota.py b/api/core/app/workflow/layers/llm_quota.py
index dd7c4745db..2422eed5a7 100644
--- a/api/core/app/workflow/layers/llm_quota.py
+++ b/api/core/app/workflow/layers/llm_quota.py
@@ -156,6 +156,7 @@ class LLMQuotaLayer(GraphEngineLayer):
         except Exception:
             logger.exception("Failed to send quota abort command")
 
+    @staticmethod
     def _supports_quota(node: Node) -> bool:
         return node.node_type in _QUOTA_NODE_TYPES