diff --git a/thefuck/conf.py b/thefuck/conf.py
index a1af962f..5d64a25a 100644
--- a/thefuck/conf.py
+++ b/thefuck/conf.py
@@ -27,7 +27,7 @@ DEFAULT_PRIORITY = 1000
 
 DEFAULT_SETTINGS = {'rules': DEFAULT_RULES,
                     'wait_command': 3,
-                    'require_confirmation': False,
+                    'require_confirmation': True,
                     'no_colors': False,
                     'debug': False,
                     'priority': {},
diff --git a/thefuck/shells.py b/thefuck/shells.py
index 337e14be..da5cfdae 100644
--- a/thefuck/shells.py
+++ b/thefuck/shells.py
@@ -9,7 +9,6 @@ from time import time
 import os
 import io
 from psutil import Process
-import six
 from .utils import DEVNULL, memoize