diff --git a/src/test/run-pass/iface-generic.rs b/src/test/run-pass/iface-generic.rs
index cc1c9b1a953..07727035a28 100644
--- a/src/test/run-pass/iface-generic.rs
+++ b/src/test/run-pass/iface-generic.rs
@@ -1,3 +1,5 @@
+// xfail-pretty
+
 iface to_str {
     fn to_str() -> str;
 }