diff --git a/test/input.output/iostream.format/input.streams/istream.unformatted/get.pass.cpp b/test/input.output/iostream.format/input.streams/istream.unformatted/get.pass.cpp
index 41a721d50..1309a00df 100644
--- a/test/input.output/iostream.format/input.streams/istream.unformatted/get.pass.cpp
+++ b/test/input.output/iostream.format/input.streams/istream.unformatted/get.pass.cpp
@@ -6,6 +6,8 @@
 // Source Licenses. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
+//
+// XFAIL: with_system_lib=x86_64-apple-darwin11
 
 // <istream>
 
diff --git a/test/input.output/iostream.format/input.streams/istream.unformatted/get_chart.pass.cpp b/test/input.output/iostream.format/input.streams/istream.unformatted/get_chart.pass.cpp
index cf06e343b..ee46566c9 100644
--- a/test/input.output/iostream.format/input.streams/istream.unformatted/get_chart.pass.cpp
+++ b/test/input.output/iostream.format/input.streams/istream.unformatted/get_chart.pass.cpp
@@ -6,6 +6,8 @@
 // Source Licenses. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
+//
+// XFAIL: with_system_lib=x86_64-apple-darwin11
 
 // <istream>
 
diff --git a/test/input.output/iostream.format/input.streams/istream.unformatted/read.pass.cpp b/test/input.output/iostream.format/input.streams/istream.unformatted/read.pass.cpp
index 20e70cfbd..b57014a9f 100644
--- a/test/input.output/iostream.format/input.streams/istream.unformatted/read.pass.cpp
+++ b/test/input.output/iostream.format/input.streams/istream.unformatted/read.pass.cpp
@@ -6,6 +6,8 @@
 // Source Licenses. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
+//
+// XFAIL: with_system_lib=x86_64-apple-darwin11
 
 // <istream>
 
diff --git a/test/input.output/iostream.format/input.streams/istream.unformatted/readsome.pass.cpp b/test/input.output/iostream.format/input.streams/istream.unformatted/readsome.pass.cpp
index 01eecb5d8..60f816df1 100644
--- a/test/input.output/iostream.format/input.streams/istream.unformatted/readsome.pass.cpp
+++ b/test/input.output/iostream.format/input.streams/istream.unformatted/readsome.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>