diff --git a/langserve/api_handler.py b/langserve/api_handler.py
index 346e89dc..8669a4da 100644
--- a/langserve/api_handler.py
+++ b/langserve/api_handler.py
@@ -776,7 +776,7 @@ async def _get_config_and_input(
             # using configuration.
             schema = self._runnable.with_config(config).input_schema
             input_ = schema.validate(body.input)
-            return config, _unpack_input(input_)
+            return config, _unpack_input(body.input)
         except ValidationError as e:
             raise RequestValidationError(e.errors(), body=body)