diff --git a/src/claude_code_sdk/_internal/transport/subprocess_cli.py b/src/claude_code_sdk/_internal/transport/subprocess_cli.py
index 530b5c5..c1223d2 100644
--- a/src/claude_code_sdk/_internal/transport/subprocess_cli.py
+++ b/src/claude_code_sdk/_internal/transport/subprocess_cli.py
@@ -209,7 +209,9 @@ class SubprocessCLITransport(Transport):
                             json_buffer = ""  # Clear buffer to prevent repeated errors
                             raise SDKJSONDecodeError(
                                 f"JSON message exceeded maximum buffer size of {_MAX_BUFFER_SIZE} bytes",
-                                None,
+                                ValueError(
+                                    f"Buffer size {len(json_buffer)} exceeds limit {_MAX_BUFFER_SIZE}"
+                                ),
                             )
 
                         try: