diff --git a/core/src/main/java/com/google/errorprone/bugpatterns/threadsafety/WellKnownMutability.java b/core/src/main/java/com/google/errorprone/bugpatterns/threadsafety/WellKnownMutability.java
index 91b31733a279..11b8c17a6ea8 100644
--- a/core/src/main/java/com/google/errorprone/bugpatterns/threadsafety/WellKnownMutability.java
+++ b/core/src/main/java/com/google/errorprone/bugpatterns/threadsafety/WellKnownMutability.java
@@ -189,6 +189,7 @@ private static ImmutableMap<String, AnnotationInfo> buildImmutableClasses(
         .add(java.math.BigInteger.class)
         .add(java.net.InetAddress.class)
         .add(java.net.URI.class)
+        .add(java.nio.ByteOrder.class)
         .add(java.nio.charset.Charset.class)
         .add(java.nio.file.Path.class)
         .add(java.nio.file.WatchEvent.class)