diff --git a/steam/guard.py b/steam/guard.py
index 7668719..2076386 100644
--- a/steam/guard.py
+++ b/steam/guard.py
@@ -290,15 +290,15 @@ def generate_twofactor_code_for_time(shared_secret, timestamp):
 
     return code
 
-def generate_confirmation_key(identity_secret, timestamp, tag=''):
+def generate_confirmation_key(identity_secret, tag, timestamp):
     """Generate confirmation key for trades. Can only be used once.
 
     :param identity_secret: authenticator identity secret
     :type identity_secret: bytes
-    :param timestamp: timestamp to use for generating key
-    :type timestamp: int
     :param tag: tag identifies what the request, see list below
     :type tag: str
+    :param timestamp: timestamp to use for generating key
+    :type timestamp: int
     :return: confirmation key
     :rtype: bytes
 
diff --git a/tests/test_guard.py b/tests/test_guard.py
index a219259..0e8ec57 100644
--- a/tests/test_guard.py
+++ b/tests/test_guard.py
@@ -12,8 +12,8 @@ class TCguard(unittest.TestCase):
         self.assertEqual(code, '94R9D')
 
     def test_generate_confirmation_key(self):
-        key = g.generate_confirmation_key(b'itsmemario', 100000)
+        key = g.generate_confirmation_key(b'itsmemario', '', 100000)
         self.assertEqual(key, b'\xed\xb5\xe5\xad\x8f\xf1\x99\x01\xc8-w\xd6\xb5 p\xccz\xd7\xd1\x05')
 
-        key = g.generate_confirmation_key(b'itsmemario', 100000, 'allow')
+        key = g.generate_confirmation_key(b'itsmemario', 'allow', 100000)
         self.assertEqual(key, b"Q'\x06\x80\xe1g\xa8m$\xb2hV\xe6g\x8b'\x8f\xf1L\xb0")