diff --git a/flake8/engine.py b/flake8/engine.py
index 5ee91a5..8d27000 100644
--- a/flake8/engine.py
+++ b/flake8/engine.py
@@ -103,11 +103,11 @@ def get_parser():
                       type='string', nargs=1, action='callback',
                       callback=callbacks.redirect_stdout)
     parser.add_option('--enable-extensions', default='',
-                      dest='enabled_extensions',
+                      dest='enable_extensions',
                       help='Enable plugins and extensions that are disabled '
                            'by default',
                       type='string')
-    parser.config_options.extend(['output_file', 'enable_extensions'])
+    parser.config_options.extend(['output-file', 'enable-extensions'])
     parser.ignored_extensions = ignored
     return parser, options_hooks
 
diff --git a/flake8/tests/test_engine.py b/flake8/tests/test_engine.py
index 2afabbb..82ba0dd 100644
--- a/flake8/tests/test_engine.py
+++ b/flake8/tests/test_engine.py
@@ -62,7 +62,7 @@ class TestEngine(unittest.TestCase):
 
         parser.ignored_extensions = ['I123', 'I345', 'I678', 'I910']
 
-        options.enabled_extensions = 'I345,\nI678,I910'
+        options.enable_extensions = 'I345,\nI678,I910'
         options.ignore = ('E121', 'E123')
 
         engine._disable_extensions(parser, options)