diff --git a/libs/core/langchain_core/tools/base.py b/libs/core/langchain_core/tools/base.py
index 9d35aa614fa2d..c5236ce743f77 100644
--- a/libs/core/langchain_core/tools/base.py
+++ b/libs/core/langchain_core/tools/base.py
@@ -822,7 +822,7 @@ def _is_message_content_block(obj: Any) -> bool:
 
 def _stringify(content: Any) -> str:
     try:
-        return json.dumps(content)
+        return json.dumps(content, ensure_ascii=False)
     except Exception:
         return str(content)