diff --git a/testing/resources/arbitrary_bytes_repo/python3_hook/main.py b/testing/resources/arbitrary_bytes_repo/python3_hook.py
similarity index 96%
rename from testing/resources/arbitrary_bytes_repo/python3_hook/main.py
rename to testing/resources/arbitrary_bytes_repo/python3_hook.py
index c6a5547c..ba698a93 100644
--- a/testing/resources/arbitrary_bytes_repo/python3_hook/main.py
+++ b/testing/resources/arbitrary_bytes_repo/python3_hook.py
@@ -5,7 +5,7 @@ from __future__ import unicode_literals
 import sys
 
 
-def func():
+def main():
     # Intentionally write mixed encoding to the output.  This should not crash
     # pre-commit and should write bytes to the output.
     sys.stdout.buffer.write('☃'.encode('UTF-8') + '²'.encode('latin1') + b'\n')
diff --git a/testing/resources/arbitrary_bytes_repo/python3_hook/__init__.py b/testing/resources/arbitrary_bytes_repo/python3_hook/__init__.py
deleted file mode 100644
index e69de29b..00000000
diff --git a/testing/resources/arbitrary_bytes_repo/setup.py b/testing/resources/arbitrary_bytes_repo/setup.py
index bf7690c0..c780e427 100644
--- a/testing/resources/arbitrary_bytes_repo/setup.py
+++ b/testing/resources/arbitrary_bytes_repo/setup.py
@@ -1,11 +1,8 @@
-from setuptools import find_packages
 from setuptools import setup
 
 setup(
     name='python3_hook',
     version='0.0.0',
-    packages=find_packages('.'),
-    entry_points={
-        'console_scripts': ['python3-hook = python3_hook.main:func'],
-    },
+    py_modules=['python3_hook'],
+    entry_points={'console_scripts': ['python3-hook=python3_hook:main']},
 )