diff --git a/testing/mozbase/mozlog/mozlog/structured/commandline.py b/testing/mozbase/mozlog/mozlog/structured/commandline.py
index 886f65fdecc1..61847e51597f 100644
--- a/testing/mozbase/mozlog/mozlog/structured/commandline.py
+++ b/testing/mozbase/mozlog/mozlog/structured/commandline.py
@@ -62,7 +62,7 @@ def add_logging_group(parser):
                                help=help_str)
 
 
-def setup_logging(suite, args, defaults=None):
+def setup_logging(suite, args, defaults):
     """
     Configure a structuredlogger based on command line arguments.
 
@@ -73,10 +73,7 @@ def setup_logging(suite, args, defaults=None):
     :param args: A dictionary of {argument_name:value} produced from
                  parsing the command line arguments for the application
     :param defaults: A dictionary of {formatter name: output stream} to apply
-                     when there is no logging supplied on the command line. If
-                     this isn't supplied, reasonable defaults are chosen
-                     (coloured mach formatting if stdout is a terminal, or raw
-                     logs otherwise).
+                     when there is no logging supplied on the command line.
 
     :rtype: StructuredLogger
     """
@@ -86,13 +83,6 @@ def setup_logging(suite, args, defaults=None):
     found_stdout_logger = False
     if not hasattr(args, 'iteritems'):
         args = vars(args)
-
-    if defaults is None:
-        if sys.__stdout__.isatty():
-            defaults = {"mach_terminal": sys.stdout}
-        else:
-            defaults = {"raw": sys.stdout}
-
     for name, values in args.iteritems():
         if name.startswith(prefix) and values is not None:
             for value in values:
diff --git a/testing/mozbase/mozlog/mozlog/structured/formatters/machformatter.py b/testing/mozbase/mozlog/mozlog/structured/formatters/machformatter.py
index 0ad2179a9954..4acddb7abce8 100644
--- a/testing/mozbase/mozlog/mozlog/structured/formatters/machformatter.py
+++ b/testing/mozbase/mozlog/mozlog/structured/formatters/machformatter.py
@@ -4,8 +4,6 @@
 
 import time
 
-import blessings
-
 import base
 
 
@@ -136,8 +134,6 @@ class MachTerminalFormatter(BaseMachFormatter):
     """
     def __init__(self, start_time=None, write_interval=False, write_times=True,
                  terminal=None):
-        if terminal is None:
-            terminal = blessings.Terminal()
         self.terminal = terminal
         BaseMachFormatter.__init__(self,
                                    start_time=start_time,
diff --git a/testing/mozbase/mozlog/setup.py b/testing/mozbase/mozlog/setup.py
index 03184d9cc113..d6e708137fc7 100644
--- a/testing/mozbase/mozlog/setup.py
+++ b/testing/mozbase/mozlog/setup.py
@@ -17,7 +17,6 @@ setup(name=PACKAGE_NAME,
       license='MPL 1.1/GPL 2.0/LGPL 2.1',
       packages=find_packages(),
       zip_safe=False,
-      install_requires=["blessings>=1.3"],
       tests_require=['mozfile'],
       platforms =['Any'],
       classifiers=['Development Status :: 4 - Beta',