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diff --git a/third_party/libphonenumber/cpp/src/normalize_utf8.h b/third_party/libphonenumber/cpp/src/normalize_utf8.h
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+++ b/third_party/libphonenumber/cpp/src/normalize_utf8.h
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+// Copyright (C) 2011 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <string>
+
+#include "utf/unicodetext.h"
+
+namespace i18n {
+namespace phonenumbers {
+
+using std::string;
+
+struct NormalizeUTF8 {
+  // Put a UTF-8 string in ASCII digits: All decimal digits (Nd) replaced by
+  // their ASCII counterparts; all other characters are copied from input to
+  // output.
+  static string NormalizeDecimalDigits(const string& number) {
+    string normalized;
+    UnicodeText number_as_unicode;
+    number_as_unicode.PointToUTF8(number.data(), number.size());
+    for (UnicodeText::const_iterator it = number_as_unicode.begin();
+         it != number_as_unicode.end();
+         ++it) {
+      int32_t digitValue = u_charDigitValue(*it);
+      if (digitValue == -1) {
+        // Not a decimal digit.
+        char utf8[4];
+        int len = it.get_utf8(utf8);
+        normalized.append(utf8, len);
+      } else {
+        normalized.push_back('0' + digitValue);
+      }
+    }
+    return normalized;
+  }
+};
+
+}  // namespace phonenumbers
+}  // namespace i18n