--- a/tests/run-tests.py	Tue Jun 05 02:50:25 2018 +0200
+++ b/tests/run-tests.py	Sat Jun 09 15:01:04 2018 +0530
@@ -2646,7 +2646,7 @@
                 expanded_args.append(arg)
         args = expanded_args
 
-        testcasepattern = re.compile(r'([\w-]+\.t|py)(#([^\s]+))')
+        testcasepattern = re.compile(br'([\w-]+\.t|py)(#([^\s]+))')
         tests = []
         for t in args:
             case = None