deleted file mode 100644
--- a/build/compare-mozconfig/compare-mozconfigs-wrapper.py
+++ /dev/null
@@ -1,34 +0,0 @@
-#!/usr/bin/python
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-from __future__ import unicode_literals
-
-import logging
-import mozunit
-import os
-import subprocess
-import unittest
-
-from buildconfig import substs
-
-log = logging.getLogger(__name__)
-
-
-class TestCompareMozconfigs(unittest.TestCase):
-    def test_compare_mozconfigs(self):
-        topsrcdir = substs['top_srcdir']
-
-        ret = subprocess.call([
-            substs['PYTHON'],
-            os.path.join(topsrcdir, 'build', 'compare-mozconfig',
-                         'compare-mozconfigs.py'),
-            topsrcdir
-        ])
-
-        self.assertEqual(0, ret)
-
-
-if __name__ == '__main__':
-    mozunit.main()

--- a/build/compare-mozconfig/compare-mozconfigs.py
+++ b/build/compare-mozconfig/compare-mozconfigs.py
@@ -4,18 +4,21 @@
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 # originally from https://hg.mozilla.org/build/tools/file/4ab9c1a4e05b/scripts/release/compare-mozconfigs.py
 
 from __future__ import unicode_literals
 
 import logging
 import os
-import sys
 import difflib
+import unittest
+
+import buildconfig
+import mozunit
 
 FAILURE_CODE = 1
 SUCCESS_CODE = 0
 
 PLATFORMS = (
     'linux32',
     'linux64',
     'macosx64',
@@ -150,20 +153,17 @@ def compare(topsrcdir):
                                    platform,
                                    whitelist)
         if not passed:
             success = False
 
     return success
 
 
-if __name__ == '__main__':
-    import argparse
-
-    parser = argparse.ArgumentParser()
-    parser.add_argument('topsrcdir', help='Path to root of source checkout')
+class TestCompareMozconfigs(unittest.TestCase):
+    def test_compare_mozconfigs(self):
+        topsrcdir = buildconfig.substs['top_srcdir']
+        self.assertTrue(compare(topsrcdir))
 
-    args = parser.parse_args()
 
+if __name__ == '__main__':
     logging.basicConfig(level=logging.INFO)
-
-    if not compare(args.topsrcdir):
-        sys.exit(1)
+    mozunit.main()

--- a/build/compare-mozconfig/python.ini
+++ b/build/compare-mozconfig/python.ini
@@ -1,1 +1,1 @@
-[compare-mozconfigs-wrapper.py]
+[compare-mozconfigs.py]