diff --git a/fx.serial/test/toml-decode.c b/fx.serial/test/toml-decode.c
index 8b2b449..bda2d82 100644
--- a/fx.serial/test/toml-decode.c
+++ b/fx.serial/test/toml-decode.c
@@ -130,7 +130,7 @@ void write_tagged_datetime(fx_datetime *data)
 
 	fx_stringstream *new_data = fx_stringstream_create();
 	fx_datetime_to_string(data, FX_DATETIME_FORMAT_RFC3339, new_data);
-	fx_stream_write_cstr(fx_stdout, fx_stringstream_ptr(new_data), NULL);
+	fx_stream_write_cstr(fx_stdout, fx_stringstream_get_cstr(new_data), NULL);
 
 	fx_stream_write_cstr(fx_stdout, "\" }", NULL);