diff --git a/test/localization/locale.categories/category.ctype/locale.ctype.byname/tolower_1.pass.cpp b/test/localization/locale.categories/category.ctype/locale.ctype.byname/tolower_1.pass.cpp
index 8f84195f..f9571490 100644
--- a/test/localization/locale.categories/category.ctype/locale.ctype.byname/tolower_1.pass.cpp
+++ b/test/localization/locale.categories/category.ctype/locale.ctype.byname/tolower_1.pass.cpp
@@ -15,6 +15,7 @@
 
 // XFAIL: with_system_lib=x86_64-apple-darwin11
 // XFAIL: with_system_lib=x86_64-apple-darwin12
+// XFAIL: linux
 
 #include <locale>
 #include <cassert>
diff --git a/test/localization/locale.categories/category.ctype/locale.ctype.byname/tolower_many.pass.cpp b/test/localization/locale.categories/category.ctype/locale.ctype.byname/tolower_many.pass.cpp
index 1f480760..9579f4df 100644
--- a/test/localization/locale.categories/category.ctype/locale.ctype.byname/tolower_many.pass.cpp
+++ b/test/localization/locale.categories/category.ctype/locale.ctype.byname/tolower_many.pass.cpp
@@ -15,6 +15,7 @@
 
 // XFAIL: with_system_lib=x86_64-apple-darwin11
 // XFAIL: with_system_lib=x86_64-apple-darwin12
+// XFAIL: linux
 
 #include <locale>
 #include <string>
diff --git a/test/localization/locale.categories/category.ctype/locale.ctype.byname/toupper_1.pass.cpp b/test/localization/locale.categories/category.ctype/locale.ctype.byname/toupper_1.pass.cpp
index d2157911..9b09e819 100644
--- a/test/localization/locale.categories/category.ctype/locale.ctype.byname/toupper_1.pass.cpp
+++ b/test/localization/locale.categories/category.ctype/locale.ctype.byname/toupper_1.pass.cpp
@@ -15,6 +15,7 @@
 
 // XFAIL: with_system_lib=x86_64-apple-darwin11
 // XFAIL: with_system_lib=x86_64-apple-darwin12
+// XFAIL: linux
 
 #include <locale>
 #include <cassert>
diff --git a/test/localization/locale.categories/category.ctype/locale.ctype.byname/toupper_many.pass.cpp b/test/localization/locale.categories/category.ctype/locale.ctype.byname/toupper_many.pass.cpp
index c3c32e71..87e9b977 100644
--- a/test/localization/locale.categories/category.ctype/locale.ctype.byname/toupper_many.pass.cpp
+++ b/test/localization/locale.categories/category.ctype/locale.ctype.byname/toupper_many.pass.cpp
@@ -15,6 +15,7 @@
 
 // XFAIL: with_system_lib=x86_64-apple-darwin11
 // XFAIL: with_system_lib=x86_64-apple-darwin12
+// XFAIL: linux
 
 #include <locale>
 #include <string>
diff --git a/test/localization/locale.categories/category.ctype/locale.ctype.byname/widen_1.pass.cpp b/test/localization/locale.categories/category.ctype/locale.ctype.byname/widen_1.pass.cpp
index ed56dd38..320e08db 100644
--- a/test/localization/locale.categories/category.ctype/locale.ctype.byname/widen_1.pass.cpp
+++ b/test/localization/locale.categories/category.ctype/locale.ctype.byname/widen_1.pass.cpp
@@ -15,6 +15,8 @@
 
 // I doubt this test is portable
 
+// XFAIL: linux
+
 #include <locale>
 #include <cassert>
 #include <limits.h>
diff --git a/test/localization/locale.categories/category.ctype/locale.ctype.byname/widen_many.pass.cpp b/test/localization/locale.categories/category.ctype/locale.ctype.byname/widen_many.pass.cpp
index c522762d..b46ae322 100644
--- a/test/localization/locale.categories/category.ctype/locale.ctype.byname/widen_many.pass.cpp
+++ b/test/localization/locale.categories/category.ctype/locale.ctype.byname/widen_many.pass.cpp
@@ -15,6 +15,8 @@
 
 // I doubt this test is portable
 
+// XFAIL: linux
+
 #include <locale>
 #include <string>
 #include <vector>