diff --git a/scrapy/tests/test_commands.py b/scrapy/tests/test_commands.py
index 050892478..0d1e79788 100644
--- a/scrapy/tests/test_commands.py
+++ b/scrapy/tests/test_commands.py
@@ -22,8 +22,7 @@ class ProjectTest(unittest.TestCase):
 
     def call(self, *new_args, **kwargs):
         out = os.tmpfile()
-        args = [sys.executable, '-m', 'scrapy.command.cmdline']
-        args.extend(new_args)
+        args = (sys.executable, '-m', 'scrapy.command.cmdline') + new_args
         return subprocess.call(args, stdout=out, stderr=out, cwd=self.cwd, \
             env=self.env, **kwargs)