diff --git a/src/ox/std/trace.hpp b/src/ox/std/trace.hpp
index 79f8e36b1..9fc709575 100644
--- a/src/ox/std/trace.hpp
+++ b/src/ox/std/trace.hpp
@@ -95,14 +95,14 @@ constexpr Error model(T *io, ox::CommonPtrWith<InitTraceMsgRcv> auto *obj) noexc
 
 struct InitTraceMsg {
 	static constexpr auto TypeName = "net.drinkingtea.ox.trace.InitTraceMsg";
-	static constexpr auto TypeVersion = 1;
-	const char *appName = "";
+	static constexpr auto TypeVersion = 2;
+	ox::BasicString<128> appName;
 };
 
 template<typename T>
 constexpr Error model(T *io, ox::CommonPtrWith<InitTraceMsg> auto *obj) noexcept {
 	oxReturnError(io->template setTypeInfo<InitTraceMsg>());
-	oxReturnError(io->fieldCString("appName", &obj->appName));
+	oxReturnError(io->field("appName", &obj->appName));
 	return {};
 }