diff --git a/test/input.output/iostream.format/input.streams/istream.unformatted/ignore_0xff.pass.cpp b/test/input.output/iostream.format/input.streams/istream.unformatted/ignore_0xff.pass.cpp
index ab0326cf..dbfe9f74 100644
--- a/test/input.output/iostream.format/input.streams/istream.unformatted/ignore_0xff.pass.cpp
+++ b/test/input.output/iostream.format/input.streams/istream.unformatted/ignore_0xff.pass.cpp
@@ -6,6 +6,9 @@
 // Source Licenses. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
+//
+// XFAIL: with_system_lib=x86_64-apple-darwin11
+// XFAIL: with_system_lib=x86_64-apple-darwin12
 
 // <istream>