diff --git a/src/test/run-pass/classes-simple.rs b/src/test/run-pass/classes-simple.rs
index 3b4df149fa58..da3963557df4 100644
--- a/src/test/run-pass/classes-simple.rs
+++ b/src/test/run-pass/classes-simple.rs
@@ -1,3 +1,5 @@
+// xfail-test FIXME: Needs metadata encoding
+
 class cat {
   priv {
     let mutable meows : uint;