diff --git a/clang-tools-extra/test/clang-tidy/check_clang_tidy.py b/clang-tools-extra/test/clang-tidy/check_clang_tidy.py
--- a/clang-tools-extra/test/clang-tidy/check_clang_tidy.py
+++ b/clang-tools-extra/test/clang-tidy/check_clang_tidy.py
@@ -31,7 +31,7 @@
 import re
 import subprocess
 import sys
-
+import locale
 
 def write_file(file_name, text):
   with open(file_name, 'w') as f:
@@ -151,6 +151,13 @@
         clang_tidy_output +
         '\n------------------------------------------------------------------')
 
+  try:
+    locale.setlocale('en_US')
+  except:
+    try:
+	  locale.setlocale('en_US.uf8')
+	except:
+
   try:
     diff_output = subprocess.check_output(
         ['diff', '-u', original_file_name, temp_file_name],