diff --git a/src/ox/claw/write.hpp b/src/ox/claw/write.hpp
index e0c8681d9..3b6599959 100644
--- a/src/ox/claw/write.hpp
+++ b/src/ox/claw/write.hpp
@@ -83,7 +83,7 @@ Result<String> writeClawHeader(T *t, ClawFormat fmt) noexcept {
 }
 
 template<typename T>
-Result<Buffer> writeClaw(T *t, ClawFormat fmt) {
+Result<Buffer> writeClaw(T *t, ClawFormat fmt = ClawFormat::Metal) {
 	oxRequire(header, detail::writeClawHeader(t, fmt));
 	oxRequire(data, fmt == ClawFormat::Metal ? writeMC(t) : writeOC(t));
 	Buffer out(header.len() + data.size());