diff --git a/gitosis/test/test_ssh.py b/gitosis/test/test_ssh.py
index e699506..9132c16 100644
--- a/gitosis/test/test_ssh.py
+++ b/gitosis/test/test_ssh.py
@@ -171,7 +171,9 @@ class WriteAuthorizedKeys_Test(object):
     def test_simple(self):
         tmp = maketemp()
         path = os.path.join(tmp, 'authorized_keys')
-        oldfp = StringIO('''\
+        f = file(path, 'w')
+        try:
+            f.write('''\
 # foo
 bar
 ### autogenerated by gitosis, DO NOT EDIT
@@ -179,12 +181,14 @@ command="/foo/bar/baz/gitosis-serve wsmith",no-port-forwarding,\
 no-X11-forwarding,no-agent-forwarding,no-pty %(key_2)s
 baz
 ''' % dict(key_2=KEY_2))
+        finally:
+            f.close()
         keydir = os.path.join(tmp, 'one')
         mkdir(keydir)
         writeFile(os.path.join(keydir, 'jdoe.pub'), KEY_1+'\n')
 
         ssh.writeAuthorizedKeys(
-            oldfp=oldfp, newpath=path, keydir=keydir)
+            path=path, keydir=keydir)
 
         f = file(path)
         try: