diff --git a/pytest_flake8.py b/pytest_flake8.py
index 80d5b0a..1e45d8f 100644
--- a/pytest_flake8.py
+++ b/pytest_flake8.py
@@ -145,6 +145,9 @@ def reportinfo(self):
             ignores = ""
         return (self.fspath, -1, "FLAKE8-check%s" % ignores)
 
+    def collect(self):
+        return iter((self,))
+
 
 class Ignorer:
     def __init__(self, ignorelines, coderex=re.compile(r"[EW]\d\d\d")):
diff --git a/test_flake8.py b/test_flake8.py
index 96bba79..0bc2461 100644
--- a/test_flake8.py
+++ b/test_flake8.py
@@ -153,6 +153,12 @@ def test_hello():
     result.assert_outcomes(failed=1)
 
 
+def test_run_on_init_file(testdir):
+    d = testdir.mkpydir("tests")
+    result = testdir.runpytest("--flake8", d / "__init__.py")
+    result.assert_outcomes(passed=1)
+
+
 @pytest.mark.xfail("sys.platform == 'win32'")
 def test_unicode_error(testdir):
     x = testdir.tmpdir.join("x.py")