--- a/OutputCheck/Driver.py
+++ b/OutputCheck/Driver.py
@@ -34,7 +34,7 @@ ExitCode = enum('SUCCESS',
 
 def main(args):
     parser = argparse.ArgumentParser(description=__doc__)
-    parser.add_argument('check_file', type=argparse.FileType('rU'), help='File containing check commands')
+    parser.add_argument('check_file', type=argparse.FileType('r'), help='File containing check commands')
     parser.add_argument('--file-to-check=', type=argparse.FileType('r'), default='-', help='File to check (default %(default)s)')
     parser.add_argument('--check-prefix=', default='CHECK', help='Prefix to use from check_file')
     parser.add_argument("-l","--log-level",type=str, default="INFO", choices=['debug','info','warning','error'])