--- a/tools/genv8constants.py	2020-11-04 09:49:14.000000000 +0100
+++ b/tools/genv8constants.py	2020-11-04 09:49:25.000000000 +0100
@@ -33,9 +33,14 @@
 
   sys.exit()
 
-pattern = re.compile(bytes('([0-9a-fA-F]{8}|[0-9a-fA-F]{16}) <(.*)>:'))
-v8dbg = re.compile(bytes('^v8dbg.*$'))
-numpattern = re.compile(bytes('^[0-9a-fA-F]{2} $'))
+if str == bytes:
+  pattern = re.compile(bytes('([0-9a-fA-F]{8}|[0-9a-fA-F]{16}) <(.*)>:'))
+  v8dbg = re.compile(bytes('^v8dbg.*$'))
+  numpattern = re.compile(bytes('^[0-9a-fA-F]{2} $'))
+else:
+  pattern = re.compile(bytes('([0-9a-fA-F]{8}|[0-9a-fA-F]{16}) <(.*)>:', 'utf-8'))
+  v8dbg = re.compile(bytes('^v8dbg.*$', 'utf-8'))
+  numpattern = re.compile(bytes('^[0-9a-fA-F]{2} $', 'utf-8'))
 octets = 4
 
 outfile.write("""