diff --git a/include/llvm/Support/ConvertUTF.h b/include/llvm/Support/ConvertUTF.h
index f2dc7ea33df..d0f2ed3c08c 100644
--- a/include/llvm/Support/ConvertUTF.h
+++ b/include/llvm/Support/ConvertUTF.h
@@ -137,11 +137,9 @@ ConversionResult ConvertUTF8toUTF32 (
   const UTF8** sourceStart, const UTF8* sourceEnd,
   UTF32** targetStart, UTF32* targetEnd, ConversionFlags flags);
 
-#ifdef CLANG_NEEDS_THESE_ONE_DAY
 ConversionResult ConvertUTF16toUTF8 (
   const UTF16** sourceStart, const UTF16* sourceEnd,
   UTF8** targetStart, UTF8* targetEnd, ConversionFlags flags);
-#endif
 
 ConversionResult ConvertUTF32toUTF8 (
   const UTF32** sourceStart, const UTF32* sourceEnd,