Index: utils/unittest/googletest/src/gtest-printers.cc
===================================================================
--- utils/unittest/googletest/src/gtest-printers.cc
+++ utils/unittest/googletest/src/gtest-printers.cc
@@ -288,7 +288,7 @@
   bool is_previous_hex = false;
   for (size_t index = 0; index < len; ++index) {
     const wchar_t cur = begin[index];
-    if (is_previous_hex && isascii(cur) && IsXDigit(static_cast<char>(cur))) {
+    if (is_previous_hex && __isascii(cur) && IsXDigit(static_cast<char>(cur))) {
       // Previous character is of '\x..' form and this character can be
       // interpreted as another hexadecimal digit in its number. Break string to
       // disambiguate.