diff --git a/libcxx/include/__charconv/from_chars_floating_point.h b/libcxx/include/__charconv/from_chars_floating_point.h
index 2860b0e8da83af..5cd3fc4a41ea1d 100644
--- a/libcxx/include/__charconv/from_chars_floating_point.h
+++ b/libcxx/include/__charconv/from_chars_floating_point.h
@@ -37,13 +37,13 @@ struct __from_chars_result {
 
 template <class _Fp>
 _LIBCPP_EXPORTED_FROM_ABI __from_chars_result<_Fp> __from_chars_floating_point(
-    [[clang::noescape]] const char* __first, [[clang::noescape]] const char* __last, chars_format __fmt);
+    _LIBCPP_NOESCAPE const char* __first, _LIBCPP_NOESCAPE const char* __last, chars_format __fmt);
 
 extern template __from_chars_result<float> __from_chars_floating_point(
-    [[clang::noescape]] const char* __first, [[clang::noescape]] const char* __last, chars_format __fmt);
+    _LIBCPP_NOESCAPE const char* __first, _LIBCPP_NOESCAPE const char* __last, chars_format __fmt);
 
 extern template __from_chars_result<double> __from_chars_floating_point(
-    [[clang::noescape]] const char* __first, [[clang::noescape]] const char* __last, chars_format __fmt);
+    _LIBCPP_NOESCAPE const char* __first, _LIBCPP_NOESCAPE const char* __last, chars_format __fmt);
 
 template <class _Fp>
 _LIBCPP_HIDE_FROM_ABI from_chars_result
diff --git a/libcxx/include/__config b/libcxx/include/__config
index fcba56f7e3d5b1..fca1a01851e81e 100644
--- a/libcxx/include/__config
+++ b/libcxx/include/__config
@@ -1167,6 +1167,12 @@ typedef __char32_t char32_t;
 #    define _LIBCPP_LIFETIMEBOUND
 #  endif
 
+#  if __has_cpp_attribute(_Clang::__noescape__)
+#    define _LIBCPP_NOESCAPE [[_Clang::__noescape__]]
+#  else
+#    define _LIBCPP_NOESCAPE
+#  endif
+
 #  if __has_attribute(__nodebug__)
 #    define _LIBCPP_NODEBUG __attribute__((__nodebug__))
 #  else
diff --git a/libcxx/src/charconv.cpp b/libcxx/src/charconv.cpp
index 3fe0afec0e283c..5e8cb7d97703b4 100644
--- a/libcxx/src/charconv.cpp
+++ b/libcxx/src/charconv.cpp
@@ -77,13 +77,13 @@ to_chars_result to_chars(char* __first, char* __last, long double __value, chars
 
 template <class _Fp>
 __from_chars_result<_Fp> __from_chars_floating_point(
-    [[clang::noescape]] const char* __first, [[clang::noescape]] const char* __last, chars_format __fmt) {
+    _LIBCPP_NOESCAPE const char* __first, _LIBCPP_NOESCAPE const char* __last, chars_format __fmt) {
   return std::__from_chars_floating_point_impl<_Fp>(__first, __last, __fmt);
 }
 
 template __from_chars_result<float> __from_chars_floating_point(
-    [[clang::noescape]] const char* __first, [[clang::noescape]] const char* __last, chars_format __fmt);
+    _LIBCPP_NOESCAPE const char* __first, _LIBCPP_NOESCAPE const char* __last, chars_format __fmt);
 
 template __from_chars_result<double> __from_chars_floating_point(
-    [[clang::noescape]] const char* __first, [[clang::noescape]] const char* __last, chars_format __fmt);
+    _LIBCPP_NOESCAPE const char* __first, _LIBCPP_NOESCAPE const char* __last, chars_format __fmt);
 _LIBCPP_END_NAMESPACE_STD