diff --git a/speedtest.py b/speedtest.py
index 186b529..3ba2d98 100755
--- a/speedtest.py
+++ b/speedtest.py
@@ -1734,7 +1734,7 @@ def parse_args():
                              'multiple. This simulates a typical file '
                              'transfer.')
     parser.add_argument('--bytes', dest='units', action='store_const',
-                        const=('byte', 8), default=('bit', 1),
+                        const=('Byte', 8), default=('bit', 1),
                         help='Display values in bytes instead of bits. Does '
                              'not affect the image generated by --share, nor '
                              'output from --json or --csv')