diff --git a/libcxx/src/support/win32/support.cpp b/libcxx/src/support/win32/support.cpp
--- a/libcxx/src/support/win32/support.cpp
+++ b/libcxx/src/support/win32/support.cpp
@@ -23,7 +23,7 @@
     // Query the count required.
     va_list ap_copy;
     va_copy(ap_copy, ap);
-    int count = _vsnprintf( NULL, 0, format, ap_copy );
+    int count = vsnprintf( NULL, 0, format, ap_copy );
     va_end(ap_copy);
     if (count < 0)
         return count;
@@ -33,7 +33,7 @@
         return -1;
     // If we haven't used exactly what was required, something is wrong.
     // Maybe bug in vsnprintf. Report the error and return.
-    if (_vsnprintf(p, buffer_size, format, ap) != count) {
+    if (vsnprintf(p, buffer_size, format, ap) != count) {
         free(p);
         return -1;
     }
diff --git a/libcxx/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_double.pass.cpp b/libcxx/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_double.pass.cpp
--- a/libcxx/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_double.pass.cpp
+++ b/libcxx/test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_double.pass.cpp
@@ -12,7 +12,10 @@
 
 // iter_type put(iter_type s, ios_base& iob, char_type fill, double v) const;
 
-// XFAIL: LIBCXX-WINDOWS-FIXME
+// FIXME: The printf functions in Microsoft's CRT have a couple quirks in
+// corner cases, failing this test.
+// XFAIL: msvc
+
 // XFAIL: LIBCXX-AIX-FIXME
 
 #include <locale>