diff --git a/src/test/run-pass/auto-encode.rs b/src/test/run-pass/auto-encode.rs
index 899c97b825ff..7b03a699e783 100644
--- a/src/test/run-pass/auto-encode.rs
+++ b/src/test/run-pass/auto-encode.rs
@@ -10,6 +10,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// xfail-test #6122
+
 #[forbid(deprecated_pattern)];
 
 extern mod extra;