diff --git a/libcxx/include/__availability b/libcxx/include/__availability
--- a/libcxx/include/__availability
+++ b/libcxx/include/__availability
@@ -135,9 +135,6 @@
 #   define _LIBCPP_AVAILABILITY_FILESYSTEM_POP
 // #   define _LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_filesystem
 
-    // This controls the availability of std::to_chars for integral arguments.
-#   define _LIBCPP_AVAILABILITY_TO_CHARS
-
     // This controls the availability of floating-point std::to_chars functions.
     // These overloads were added later than the integer overloads.
 #   define _LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT
@@ -253,9 +250,6 @@
 #       define _LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_filesystem
 #   endif
 
-#   define _LIBCPP_AVAILABILITY_TO_CHARS                                        \
-        _LIBCPP_AVAILABILITY_FILESYSTEM
-
 #   define _LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT                         \
         __attribute__((unavailable))
 
diff --git a/libcxx/include/charconv b/libcxx/include/charconv
--- a/libcxx/include/charconv
+++ b/libcxx/include/charconv
@@ -154,7 +154,6 @@
         return __t - (__v < __pow10_64[__t]) + 1;
     }
 
-    _LIBCPP_AVAILABILITY_TO_CHARS
     static _LIBCPP_HIDE_FROM_ABI char* __convert(_Tp __v, char* __p)
     {
         return __base_10_u64(__v, __p);
@@ -175,7 +174,6 @@
         return __t - (__v < __pow10_32[__t]) + 1;
     }
 
-    _LIBCPP_AVAILABILITY_TO_CHARS
     static _LIBCPP_HIDE_FROM_ABI char* __convert(_Tp __v, char* __p)
     {
         return __base_10_u32(__v, __p);
@@ -272,7 +270,6 @@
 }
 
 template <typename _Tp>
-_LIBCPP_AVAILABILITY_TO_CHARS
 inline _LIBCPP_HIDE_FROM_ABI to_chars_result
 __to_chars_itoa(char* __first, char* __last, _Tp __value, true_type)
 {
@@ -287,7 +284,6 @@
 }
 
 template <typename _Tp>
-_LIBCPP_AVAILABILITY_TO_CHARS
 inline _LIBCPP_HIDE_FROM_ABI to_chars_result
 __to_chars_itoa(char* __first, char* __last, _Tp __value, false_type)
 {
@@ -301,7 +297,6 @@
 }
 
 template <typename _Tp>
-_LIBCPP_AVAILABILITY_TO_CHARS
 inline _LIBCPP_HIDE_FROM_ABI to_chars_result
 __to_chars_integral(char* __first, char* __last, _Tp __value, int __base,
                     true_type)
@@ -508,7 +503,7 @@
 }
 
 template <typename _Tp>
-_LIBCPP_AVAILABILITY_TO_CHARS _LIBCPP_HIDE_FROM_ABI int
+_LIBCPP_HIDE_FROM_ABI int
 __to_chars_integral_width(_Tp __value, unsigned __base) {
   _LIBCPP_ASSERT(__value >= 0, "The function requires a non-negative value.");
 
@@ -535,7 +530,6 @@
 }
 
 template <typename _Tp>
-_LIBCPP_AVAILABILITY_TO_CHARS
 inline _LIBCPP_HIDE_FROM_ABI to_chars_result
 __to_chars_integral(char* __first, char* __last, _Tp __value, int __base,
                     false_type)
@@ -568,7 +562,6 @@
 }
 
 template <typename _Tp, typename enable_if<is_integral<_Tp>::value, int>::type = 0>
-_LIBCPP_AVAILABILITY_TO_CHARS
 inline _LIBCPP_HIDE_FROM_ABI to_chars_result
 to_chars(char* __first, char* __last, _Tp __value)
 {
@@ -576,7 +569,6 @@
 }
 
 template <typename _Tp, typename enable_if<is_integral<_Tp>::value, int>::type = 0>
-_LIBCPP_AVAILABILITY_TO_CHARS
 inline _LIBCPP_HIDE_FROM_ABI to_chars_result
 to_chars(char* __first, char* __last, _Tp __value, int __base)
 {
diff --git a/libcxx/test/libcxx/utilities/charconv/charconv.to.chars/availability.fail.cpp b/libcxx/test/libcxx/utilities/charconv/charconv.to.chars/availability.fail.cpp
deleted file mode 100644
--- a/libcxx/test/libcxx/utilities/charconv/charconv.to.chars/availability.fail.cpp
+++ /dev/null
@@ -1,27 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++03
-// REQUIRES: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
-
-// Test the availability markup on std::to_chars.
-
-#include <charconv>
-
-int main(int, char**)
-{
-    char buf[100];
-    int int_value = 33;
-    long long_value = 33;
-    int base = 2;
-    std::to_chars(buf, buf + 100, int_value); // expected-error{{is unavailable: introduced in}}
-    std::to_chars(buf, buf + 100, int_value, base); // expected-error{{is unavailable: introduced in}}
-
-    std::to_chars(buf, buf + 100, long_value); // expected-error{{is unavailable: introduced in}}
-    std::to_chars(buf, buf + 100, long_value, base); // expected-error{{is unavailable: introduced in}}
-}
diff --git a/libcxx/test/std/utilities/charconv/charconv.to.chars/integral.pass.cpp b/libcxx/test/std/utilities/charconv/charconv.to.chars/integral.pass.cpp
--- a/libcxx/test/std/utilities/charconv/charconv.to.chars/integral.pass.cpp
+++ b/libcxx/test/std/utilities/charconv/charconv.to.chars/integral.pass.cpp
@@ -10,10 +10,6 @@
 // UNSUPPORTED: !stdlib=libc++ && c++11
 // UNSUPPORTED: !stdlib=libc++ && c++14
 
-// to_chars requires functions in the dylib that were introduced in Mac OS 10.15.
-//
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
-
 // <charconv>
 
 // to_chars_result to_chars(char* first, char* last, Integral value,