diff --git a/test/std/input.output/file.streams/fstreams/filebuf.virtuals/overflow.pass.cpp b/test/std/input.output/file.streams/fstreams/filebuf.virtuals/overflow.pass.cpp
index 1da3856..042fe03 100644
--- a/test/std/input.output/file.streams/fstreams/filebuf.virtuals/overflow.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/filebuf.virtuals/overflow.pass.cpp
@@ -7,6 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// REQUIRES: locale.en_US.UTF-8
+
 // <fstream>
 
 // int_type overflow(int_type c = traits::eof());
diff --git a/test/std/input.output/file.streams/fstreams/filebuf.virtuals/underflow.pass.cpp b/test/std/input.output/file.streams/fstreams/filebuf.virtuals/underflow.pass.cpp
index e34bc84..9ada23b 100644
--- a/test/std/input.output/file.streams/fstreams/filebuf.virtuals/underflow.pass.cpp
+++ b/test/std/input.output/file.streams/fstreams/filebuf.virtuals/underflow.pass.cpp
@@ -7,6 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// REQUIRES: locale.en_US.UTF-8
+
 // <fstream>
 
 // int_type underflow();
diff --git a/test/std/input.output/iostream.format/ext.manip/get_time.pass.cpp b/test/std/input.output/iostream.format/ext.manip/get_time.pass.cpp
index 17ff642..a8b82a6 100644
--- a/test/std/input.output/iostream.format/ext.manip/get_time.pass.cpp
+++ b/test/std/input.output/iostream.format/ext.manip/get_time.pass.cpp
@@ -7,6 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// REQUIRES: locale.en_US.UTF-8
+
 // <iomanip>
 
 // template <class charT> T9 get_time(struct tm* tmb, const charT* fmt);
diff --git a/test/std/input.output/iostream.format/ext.manip/put_time.pass.cpp b/test/std/input.output/iostream.format/ext.manip/put_time.pass.cpp
index 52a98a1..f4e3ded 100644
--- a/test/std/input.output/iostream.format/ext.manip/put_time.pass.cpp
+++ b/test/std/input.output/iostream.format/ext.manip/put_time.pass.cpp
@@ -7,6 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// REQUIRES: locale.en_US.UTF-8
+
 // <iomanip>
 
 // template <class charT> T10 put_time(const struct tm* tmb, const charT* fmt);
diff --git a/test/std/input.output/iostreams.base/ios.base/ios.base.callback/register_callback.pass.cpp b/test/std/input.output/iostreams.base/ios.base/ios.base.callback/register_callback.pass.cpp
index c0ed315..f4d541e 100644
--- a/test/std/input.output/iostreams.base/ios.base/ios.base.callback/register_callback.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios.base/ios.base.callback/register_callback.pass.cpp
@@ -7,6 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// REQUIRES: locale.en_US.UTF-8
+
 // <ios>
 
 // class ios_base
diff --git a/test/std/input.output/iostreams.base/ios.base/ios.base.locales/imbue.pass.cpp b/test/std/input.output/iostreams.base/ios.base/ios.base.locales/imbue.pass.cpp
index 4e34c08..1cad020 100644
--- a/test/std/input.output/iostreams.base/ios.base/ios.base.locales/imbue.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios.base/ios.base.locales/imbue.pass.cpp
@@ -7,6 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// REQUIRES: locale.en_US.UTF-8
+
 // <ios>
 
 // class ios_base
diff --git a/test/std/input.output/iostreams.base/ios/basic.ios.members/imbue.pass.cpp b/test/std/input.output/iostreams.base/ios/basic.ios.members/imbue.pass.cpp
index 6d4ce5f..1c1c8be 100644
--- a/test/std/input.output/iostreams.base/ios/basic.ios.members/imbue.pass.cpp
+++ b/test/std/input.output/iostreams.base/ios/basic.ios.members/imbue.pass.cpp
@@ -7,6 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// REQUIRES: locale.en_US.UTF-8
+
 // <ios>
 
 // template <class charT, class traits> class basic_ios
diff --git a/test/std/input.output/stream.buffers/streambuf/streambuf.cons/copy.pass.cpp b/test/std/input.output/stream.buffers/streambuf/streambuf.cons/copy.pass.cpp
index c1e1839..7ca8f37 100644
--- a/test/std/input.output/stream.buffers/streambuf/streambuf.cons/copy.pass.cpp
+++ b/test/std/input.output/stream.buffers/streambuf/streambuf.cons/copy.pass.cpp
@@ -7,6 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// REQUIRES: locale.en_US.UTF-8
+
 // <streambuf>
 
 // template <class charT, class traits = char_traits<charT> >
diff --git a/test/std/input.output/stream.buffers/streambuf/streambuf.cons/default.pass.cpp b/test/std/input.output/stream.buffers/streambuf/streambuf.cons/default.pass.cpp
index d8ca8ae..0572a9b 100644
--- a/test/std/input.output/stream.buffers/streambuf/streambuf.cons/default.pass.cpp
+++ b/test/std/input.output/stream.buffers/streambuf/streambuf.cons/default.pass.cpp
@@ -7,6 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// REQUIRES: locale.en_US.UTF-8
+
 // <streambuf>
 
 // template <class charT, class traits = char_traits<charT> >
diff --git a/test/std/input.output/stream.buffers/streambuf/streambuf.protected/streambuf.assign/assign.pass.cpp b/test/std/input.output/stream.buffers/streambuf/streambuf.protected/streambuf.assign/assign.pass.cpp
index 8031989..fc1a18f 100644
--- a/test/std/input.output/stream.buffers/streambuf/streambuf.protected/streambuf.assign/assign.pass.cpp
+++ b/test/std/input.output/stream.buffers/streambuf/streambuf.protected/streambuf.assign/assign.pass.cpp
@@ -7,6 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// REQUIRES: locale.en_US.UTF-8
+
 // <streambuf>
 
 // template <class charT, class traits = char_traits<charT> >
diff --git a/test/std/input.output/stream.buffers/streambuf/streambuf.protected/streambuf.assign/swap.pass.cpp b/test/std/input.output/stream.buffers/streambuf/streambuf.protected/streambuf.assign/swap.pass.cpp
index 7a23206..4ede8a5 100644
--- a/test/std/input.output/stream.buffers/streambuf/streambuf.protected/streambuf.assign/swap.pass.cpp
+++ b/test/std/input.output/stream.buffers/streambuf/streambuf.protected/streambuf.assign/swap.pass.cpp
@@ -7,6 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// REQUIRES: locale.en_US.UTF-8
+
 // <streambuf>
 
 // template <class charT, class traits = char_traits<charT> >
diff --git a/test/std/localization/locale.categories/category.collate/locale.collate.byname/hash.pass.cpp b/test/std/localization/locale.categories/category.collate/locale.collate.byname/hash.pass.cpp
index f8641cb..df67f43 100644
--- a/test/std/localization/locale.categories/category.collate/locale.collate.byname/hash.pass.cpp
+++ b/test/std/localization/locale.categories/category.collate/locale.collate.byname/hash.pass.cpp
@@ -7,6 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// REQUIRES: locale.en_US.UTF-8
+
 // <locale>
 
 // template <class charT> class collate_byname
diff --git a/test/std/localization/locale.categories/category.collate/locale.collate.byname/types.pass.cpp b/test/std/localization/locale.categories/category.collate/locale.collate.byname/types.pass.cpp
index 04974b2..7c07c71 100644
--- a/test/std/localization/locale.categories/category.collate/locale.collate.byname/types.pass.cpp
+++ b/test/std/localization/locale.categories/category.collate/locale.collate.byname/types.pass.cpp
@@ -7,6 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// REQUIRES: locale.en_US.UTF-8
+
 // <locale>
 
 // template <class charT>
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/ctor_wchar_t.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/ctor_wchar_t.pass.cpp
index bc55f00..adaf4e8 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/ctor_wchar_t.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt.byname/ctor_wchar_t.pass.cpp
@@ -7,6 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// REQUIRES: locale.en_US.UTF-8
+
 // <locale>
 
 // template <> class codecvt_byname<wchar_t, char, mbstate_t>
diff --git a/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/types.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/types.pass.cpp
index 03e8dfc..fdfab57 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/types.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.ctype.byname/types.pass.cpp
@@ -7,6 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// REQUIRES: locale.en_US.UTF-8
+
 // <locale>
 
 // template <class CharT>
diff --git a/test/std/localization/locales/locale/locale.cons/default.pass.cpp b/test/std/localization/locales/locale/locale.cons/default.pass.cpp
index 1efc939..2bb3c9a 100644
--- a/test/std/localization/locales/locale/locale.cons/default.pass.cpp
+++ b/test/std/localization/locales/locale/locale.cons/default.pass.cpp
@@ -7,6 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// REQUIRES: locale.en_US.UTF-8
+
 // <locale>
 
 // locale() throw();
diff --git a/test/std/localization/locales/locale/locale.cons/locale_string_cat.pass.cpp b/test/std/localization/locales/locale/locale.cons/locale_string_cat.pass.cpp
index d48a572..59fbc59 100644
--- a/test/std/localization/locales/locale/locale.cons/locale_string_cat.pass.cpp
+++ b/test/std/localization/locales/locale/locale.cons/locale_string_cat.pass.cpp
@@ -6,7 +6,8 @@
 // Source Licenses. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
-
+ 
+// REQUIRES: locale.en_US.UTF-8
 // REQUIRES: locale.ru_RU.UTF-8
 // UNSUPPORTED: sanitizer-new-delete
 
diff --git a/test/std/localization/locales/locale/locale.members/name.pass.cpp b/test/std/localization/locales/locale/locale.members/name.pass.cpp
index 9d9b142..13ae272 100644
--- a/test/std/localization/locales/locale/locale.members/name.pass.cpp
+++ b/test/std/localization/locales/locale/locale.members/name.pass.cpp
@@ -7,6 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// REQUIRES: locale.en_US.UTF-8
+
 // <locale>
 
 // basic_string<char> name() const;
diff --git a/test/std/localization/locales/locale/locale.operators/eq.pass.cpp b/test/std/localization/locales/locale/locale.operators/eq.pass.cpp
index ec118e0..c809f49 100644
--- a/test/std/localization/locales/locale/locale.operators/eq.pass.cpp
+++ b/test/std/localization/locales/locale/locale.operators/eq.pass.cpp
@@ -7,6 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// REQUIRES: locale.en_US.UTF-8
+
 // <locale>
 
 // basic_string<char> name() const;
diff --git a/test/std/localization/locales/locale/locale.statics/global.pass.cpp b/test/std/localization/locales/locale/locale.statics/global.pass.cpp
index 59a6bc6..d4b1155 100644
--- a/test/std/localization/locales/locale/locale.statics/global.pass.cpp
+++ b/test/std/localization/locales/locale/locale.statics/global.pass.cpp
@@ -7,6 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// REQUIRES: locale.en_US.UTF-8
+
 // <locale>
 
 // static const locale& classic();
diff --git a/test/std/re/re.regex/re.regex.locale/imbue.pass.cpp b/test/std/re/re.regex/re.regex.locale/imbue.pass.cpp
index be0b26d..c7ad394 100644
--- a/test/std/re/re.regex/re.regex.locale/imbue.pass.cpp
+++ b/test/std/re/re.regex/re.regex.locale/imbue.pass.cpp
@@ -7,6 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// REQUIRES: locale.en_US.UTF-8
+
 // <regex>
 
 // template <class charT, class traits = regex_traits<charT>> class basic_regex;
diff --git a/test/std/re/re.traits/default.pass.cpp b/test/std/re/re.traits/default.pass.cpp
index c9a97e0..defadd9 100644
--- a/test/std/re/re.traits/default.pass.cpp
+++ b/test/std/re/re.traits/default.pass.cpp
@@ -8,6 +8,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// REQUIRES: locale.en_US.UTF-8
+
 // <regex>
 
 // template <class charT> struct regex_traits;
diff --git a/test/std/re/re.traits/getloc.pass.cpp b/test/std/re/re.traits/getloc.pass.cpp
index 27ab6cd..0b7810a 100644
--- a/test/std/re/re.traits/getloc.pass.cpp
+++ b/test/std/re/re.traits/getloc.pass.cpp
@@ -7,6 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// REQUIRES: locale.en_US.UTF-8
+
 // <regex>
 
 // template <class charT> struct regex_traits;
diff --git a/test/std/re/re.traits/imbue.pass.cpp b/test/std/re/re.traits/imbue.pass.cpp
index 11eca41..6988058 100644
--- a/test/std/re/re.traits/imbue.pass.cpp
+++ b/test/std/re/re.traits/imbue.pass.cpp
@@ -7,6 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// REQUIRES: locale.en_US.UTF-8
+
 // <regex>
 
 // template <class charT> struct regex_traits;