Generator expressons are ok now.

1 files changed, 1 insertions, 1 deletions

diff --git a/coverage/backward.py b/coverage/backward.py
index 124d025..8237d01 100644
--- a/coverage/backward.py
+++ b/coverage/backward.py
@@ -123,7 +123,7 @@ else:
 
     def binary_bytes(byte_values):
         """Produce a byte string with the ints from `byte_values`."""
-        return "".join([chr(b) for b in byte_values])
+        return "".join(chr(b) for b in byte_values)
 
     def byte_to_int(byte_value):
         """Turn an element of a bytes object into an int."""