diff --git a/googletest/test/gtest-port_test.cc b/googletest/test/gtest-port_test.cc
index 4ed4afca..51956f05 100644
--- a/googletest/test/gtest-port_test.cc
+++ b/googletest/test/gtest-port_test.cc
@@ -67,8 +67,8 @@ TEST(IsXDigitTest, WorksForNarrowAscii) {
 }
 
 TEST(IsXDigitTest, ReturnsFalseForNarrowNonAscii) {
-  EXPECT_FALSE(IsXDigit(static_cast<char>(0x80)));
-  EXPECT_FALSE(IsXDigit(static_cast<char>('0' | 0x80)));
+  EXPECT_FALSE(IsXDigit(static_cast<char>('\x80')));
+  EXPECT_FALSE(IsXDigit(static_cast<char>('0' | '\x80')));
 }
 
 TEST(IsXDigitTest, WorksForWideAscii) {