diff --git a/deps/ox/src/ox/std/test/tests.cpp b/deps/ox/src/ox/std/test/tests.cpp
index cec25157..c2e895e5 100644
--- a/deps/ox/src/ox/std/test/tests.cpp
+++ b/deps/ox/src/ox/std/test/tests.cpp
@@ -207,6 +207,8 @@ static std::map<ox::String, ox::Error(*)()> tests = {
 			constexpr ox::StringView uuidStr = "8d814442-f46e-4cc3-8edc-ca3c01cc86db";
 			oxRequire(uuid, ox::UUID::fromString(uuidStr));
 			oxExpect(uuid.toString(), uuidStr);
+			oxExpect(ox::UUID{}.isNull(), true);
+			oxExpect(ox::UUID::fromString(uuidStr).value.isNull(), false);
 			return OxError(0);
 		}
 	},