diff --git a/flake8_isort.py b/flake8_isort.py
index ab96cce..26936ee 100644
--- a/flake8_isort.py
+++ b/flake8_isort.py
@@ -24,19 +24,17 @@ def __init__(self, tree, filename, lines):
         self.filename = filename
         self.lines = lines
 
-    @classmethod
-    def add_options(cls, parser):
-        parser.add_option(
+    def add_options(option_manager):
+        option_manager.add_option(
             '--isort-show-traceback',
             action='store_true',
             parse_from_config=True,
             help='Show full traceback with diff from isort',
         )
 
-    @classmethod
-    def parse_options(cls, options):
-        cls.stdin_display_name = options.stdin_display_name
-        cls.show_traceback = options.isort_show_traceback
+    def parse_options(self, option_manager, options, args):
+        self.stdin_display_name = options.stdin_display_name
+        self.show_traceback = options.isort_show_traceback
 
 
 class Flake8Isort4(Flake8IsortBase):
diff --git a/run_tests.py b/run_tests.py
index 7ecf98e..38ac9d5 100644
--- a/run_tests.py
+++ b/run_tests.py
@@ -223,7 +223,7 @@ def test_isort_formatted_output(tmpdir):
     diff = ' from __future__ import division\n+\n import os'
 
     checker = Flake8Isort(None, file_path, lines)
-    checker.parse_options(options(None, True, 'stdin'))
+    checker.parse_options(None, options(None, True, 'stdin'), None)
     ret = list(checker.run())
     assert len(ret) == 1
     assert ret[0][0] == 3