diff --git a/src/claude_code_sdk/_internal/transport/subprocess_cli.py b/src/claude_code_sdk/_internal/transport/subprocess_cli.py
index 288b2e7d..43de4936 100644
--- a/src/claude_code_sdk/_internal/transport/subprocess_cli.py
+++ b/src/claude_code_sdk/_internal/transport/subprocess_cli.py
@@ -203,7 +203,6 @@ async def read_stderr() -> None:
                         json_buffer += json_line
 
                         if len(json_buffer) > _MAX_BUFFER_SIZE:
-                            json_buffer = ""
                             raise SDKJSONDecodeError(
                                 f"JSON message exceeded maximum buffer size of {_MAX_BUFFER_SIZE} bytes",
                                 ValueError(