diff --git a/deps/ox/src/ox/std/test/tests.cpp b/deps/ox/src/ox/std/test/tests.cpp
index 3c81933f..815d66cc 100644
--- a/deps/ox/src/ox/std/test/tests.cpp
+++ b/deps/ox/src/ox/std/test/tests.cpp
@@ -153,7 +153,8 @@ static std::map<ox::String, ox::Error(*)()> tests = {
 			oxExpect(ox::serialize<uint32_t>(4).unwrap(), BA({4, 0, 0, 0}));
 			oxExpect(ox::serialize<uint32_t>(256).unwrap(), BA({0, 1, 0, 0}));
 			oxExpect(ox::serialize<uint32_t>(257).unwrap(), BA({1, 1, 0, 0}));
-			oxExpect(ox::serialize<uint32_t>(0xffff'ffff).unwrap(), BA({-1, -1, -1, -1}));
+			constexpr auto neg1 = static_cast<char>(-1); // ARM64 Linux assumes -1 literals are ints...
+			oxExpect(ox::serialize<uint32_t>(0xffff'ffff).unwrap(), BA({neg1, neg1, neg1, neg1}));
 			return OxError(0);
 		}
 	},