diff --git a/pytest_flake8.py b/pytest_flake8.py
index 5582136..2ac7a28 100644
--- a/pytest_flake8.py
+++ b/pytest_flake8.py
@@ -183,7 +183,7 @@ def check_file(path, flake8ignore, maxlength, maxcomplexity,
     app.find_plugins()
     app.register_plugin_options()
     app.parse_configuration_and_cli(args)
-    app.options.ignore = flake8ignore
+    app.options.ignore.extend(flake8ignore)
     app.make_formatter()  # fix this
     app.make_notifier()
     app.make_guide()