diff --git a/api/services/tools/api_tools_manage_service.py b/api/services/tools/api_tools_manage_service.py
index 0e3bd3a7b83c68..988f9df927e4f7 100644
--- a/api/services/tools/api_tools_manage_service.py
+++ b/api/services/tools/api_tools_manage_service.py
@@ -425,7 +425,7 @@ def test_api_tool_preview(
                     "tenant_id": tenant_id,
                 }
             )
-            result = tool.validate_credentials(credentials, parameters)
+            result = runtime_tool.validate_credentials(credentials, parameters)
         except Exception as e:
             return {"error": str(e)}