diff --git a/include/upa/url_utf.h b/include/upa/url_utf.h
index b7c267a..dd01b96 100644
--- a/include/upa/url_utf.h
+++ b/include/upa/url_utf.h
@@ -25,10 +25,10 @@ class url_utf {
     template <class Output, void appendByte(unsigned char, Output&)>
     static void append_utf8(uint32_t code_point, Output& output);
 
-#if 0 // UNUSED
+/*** UNUSED ***
     template <class Output>
     static void append_utf16(uint32_t code_point, Output& output);
-#endif
+***/
 
     // Convert to utf-8 string
     static std::string to_utf8_string(const char16_t* first, const char16_t* last);
@@ -236,7 +236,7 @@ inline void url_utf::append_utf8(uint32_t code_point, Output& output) {
     }
 }
 
-#if 0 // UNUSED
+/*** UNUSED ***
 // Modified version of the U16_APPEND_UNSAFE macro in utf16.h from ICU
 //
 // It converts code_point to UTF-16 code units sequence and appends to output.
@@ -251,7 +251,7 @@ inline void url_utf::append_utf16(uint32_t code_point, Output& output) {
         output.push_back(static_cast<char16_t>((code_point & 0x3ff) | 0xdc00));
     }
 }
-#endif
+***/
 
 
 } // namespace upa