diff --git a/libcxx/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.statics/classic_table.pass.cpp b/libcxx/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.statics/classic_table.pass.cpp
--- a/libcxx/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.statics/classic_table.pass.cpp
+++ b/libcxx/test/std/localization/locale.categories/category.ctype/facet.ctype.special/facet.ctype.char.statics/classic_table.pass.cpp
@@ -12,8 +12,6 @@
 
 // static const mask* classic_table() throw();
 
-// XFAIL: LIBCXX-WINDOWS-FIXME
-
 #include <locale>
 #include <cassert>
 
@@ -29,19 +27,29 @@
     const mask *p = F::classic_table();
     const mask defined = F::space | F::print | F::cntrl | F::upper | F::lower
                     | F::alpha | F::digit | F::punct | F::xdigit | F::blank;
+#ifdef _WIN32
+    // On Windows, the alpha and print masks aren't individual bits that
+    // are set, but are only usable as masks, as they are combinations of
+    // the bits for upper/lower/digit/blank/punct.
+    const mask bit_alpha = 0;
+    const mask bit_print = 0;
+#else
+    const mask bit_alpha = F::alpha;
+    const mask bit_print = F::print;
+#endif
 
     for ( size_t i = 0; i < 128; ++i ) // values above 128 are not consistent
     {
         mask set = 0;
 
         if ( i  < 32  || i  > 126 ) set |= F::cntrl;
-        if ( i >= 32  && i <= 126 ) set |= F::print;
+        if ( i >= 32  && i <= 126 ) set |= bit_print;
 
         if (( i >= 9 && i <= 13) || i == 32 ) set |= F::space;
         if ( i == 9 || i == 32 ) set |= F::blank;
 
-        if ( i >= 'A' && i <= 'Z' ) set |= F::alpha;
-        if ( i >= 'a' && i <= 'z' ) set |= F::alpha;
+        if ( i >= 'A' && i <= 'Z' ) set |= bit_alpha;
+        if ( i >= 'a' && i <= 'z' ) set |= bit_alpha;
         if ( i >= 'A' && i <= 'Z' ) set |= F::upper;
         if ( i >= 'a' && i <= 'z' ) set |= F::lower;
 
@@ -55,6 +63,14 @@
         if ( i >=  91 && i <=  96 ) set |= F::punct;    // '[' .. '`'
         if ( i >= 123 && i <= 126 ) set |= F::punct;    // '{' .. '~'    }
 
+#ifdef _WIN32
+        // The underlying Windows __pctype_func() table doesn't have the blank
+        // bit set for horizontal tab (9). The Windows CRT implementation of
+        // the isblank() function instead has a special case check for the
+        // horizontal tab character.
+        if (i == 9) set &= ~F::blank;
+#endif
+
         assert(( p[i] &  set) == set);            // all the right bits set
         assert(((p[i] & ~set) & defined) == 0);   // no extra ones
     }