diff --git a/dspy/adapters/chat_adapter.py b/dspy/adapters/chat_adapter.py
index 0b1740542..edb5e1870 100644
--- a/dspy/adapters/chat_adapter.py
+++ b/dspy/adapters/chat_adapter.py
@@ -388,7 +388,7 @@ def field_metadata(field_name, field_info):
             desc = f"must be one of: {'; '.join([str(x) for x in type_.__args__])}"
         else:
             desc = "must be pareseable according to the following JSON schema: "
-            desc += json.dumps(prepare_schema(type_))
+            desc += json.dumps(prepare_schema(type_), ensure_ascii=False)
 
         desc = (" " * 8) + f"# note: the value you produce {desc}" if desc else ""
         return f"{{{field_name}}}{desc}"