diff --git a/src/utf.cc b/src/utf.cc
index 81c93ca..9356197 100644
--- a/src/utf.cc
+++ b/src/utf.cc
@@ -2,6 +2,8 @@
 
 #include "utf.h"
 
+#include "logging.h"
+
 namespace art {
 
 size_t CountModifiedUtf8Chars(const char* utf8) {
@@ -31,6 +33,24 @@
   }
 }
 
+void ConvertUtf16ToModifiedUtf8(char* utf8_out, const uint16_t* utf16_in, size_t char_count) {
+  while (char_count--) {
+    uint16_t ch = *utf16_in++;
+    if (ch > 0 && ch <= 0x7f) {
+      *utf8_out++ = ch;
+    } else {
+      if (ch > 0x07ff) {
+        *utf8_out++ = (ch >> 12) | 0xe0;
+        *utf8_out++ = ((ch >> 6) & 0x3f) | 0x80;
+        *utf8_out++ = (ch & 0x3f) | 0x80;
+      } else /*(ch > 0x7f || ch == 0)*/ {
+        *utf8_out++ = (ch >> 6) | 0xc0;
+        *utf8_out++ = (ch & 0x3f) | 0x80;
+      }
+    }
+  }
+}
+
 int32_t ComputeUtf16Hash(const uint16_t* chars, size_t char_count) {
   int32_t hash = 0;
   while (char_count--) {