diff --git a/icu4c/source/common/unicode/char16ptr.h b/icu4c/source/common/unicode/char16ptr.h
index 2b55cce6a9a..daf35cd43ba 100644
--- a/icu4c/source/common/unicode/char16ptr.h
+++ b/icu4c/source/common/unicode/char16ptr.h
@@ -315,7 +315,7 @@ inline OldUChar *toOldUCharPtr(char16_t *p) {
 template<typename T>
 constexpr bool ConvertibleToU16StringView =
     std::is_convertible_v<T, std::u16string_view>
-#if !U_CHAR16_IS_TYPEDEF
+#if !U_CHAR16_IS_TYPEDEF && (!defined(_LIBCPP_VERSION) || _LIBCPP_VERSION < 180000)
     || std::is_convertible_v<T, std::basic_string_view<uint16_t>>
 #endif
 #if U_SIZEOF_WCHAR_T==2
@@ -330,7 +330,7 @@ namespace internal {
  */
 inline std::u16string_view toU16StringView(std::u16string_view sv) { return sv; }
 
-#if !U_CHAR16_IS_TYPEDEF
+#if !U_CHAR16_IS_TYPEDEF && (!defined(_LIBCPP_VERSION) || _LIBCPP_VERSION < 180000)
 /**
  * Basically undefined behavior but sometimes necessary conversion
  * from std::basic_string_view<uint16_t> to std::u16string_view.
diff --git a/icu4c/source/common/unicode/unistr.h b/icu4c/source/common/unicode/unistr.h
index 72a2417694c..41743f4f541 100644
--- a/icu4c/source/common/unicode/unistr.h
+++ b/icu4c/source/common/unicode/unistr.h
@@ -3122,8 +3122,10 @@ public:
    */
   UNISTR_FROM_STRING_EXPLICIT UnicodeString(const char16_t *text) :
       UnicodeString(text, -1) {}
+#endif  // U_HIDE_DRAFT_API
 
-#if !U_CHAR16_IS_TYPEDEF
+#if !U_CHAR16_IS_TYPEDEF && \
+    (defined(U_HIDE_DRAFT_API) || (defined(_LIBCPP_VERSION) && _LIBCPP_VERSION >= 180000))
   /**
    * uint16_t * constructor.
    * Delegates to UnicodeString(const char16_t *).
@@ -3147,7 +3149,7 @@ public:
       UnicodeString(ConstChar16Ptr(text), -1) {}
 #endif
 
-#if U_SIZEOF_WCHAR_T==2 || defined(U_IN_DOXYGEN)
+#if defined(U_HIDE_DRAFT_API) && (U_SIZEOF_WCHAR_T==2 || defined(U_IN_DOXYGEN))
   /**
    * wchar_t * constructor.
    * (Only defined if U_SIZEOF_WCHAR_T==2.)
@@ -3171,7 +3173,6 @@ public:
   UNISTR_FROM_STRING_EXPLICIT UnicodeString(const wchar_t *text) :
       UnicodeString(ConstChar16Ptr(text), -1) {}
 #endif
-#endif  // U_HIDE_DRAFT_API
 
   /**
    * nullptr_t constructor.