diff --git a/setup.py b/setup.py
index d7c175c..1f28737 100644
--- a/setup.py
+++ b/setup.py
@@ -5,7 +5,7 @@ from setuptools import setup
 from setuptools import find_packages
 
 __author__ = 'Ryan McGrath <ryan@venodesigns.net>'
-__version__ = '1.4.2'
+__version__ = '1.4.3'
 
 setup(
 	# Basic package information.
diff --git a/twython/twython.py b/twython/twython.py
index 712302a..fad12b7 100644
--- a/twython/twython.py
+++ b/twython/twython.py
@@ -9,7 +9,7 @@
 """
 
 __author__ = "Ryan McGrath <ryan@venodesigns.net>"
-__version__ = "1.4.2"
+__version__ = "1.4.3"
 
 import cgi
 import urllib
@@ -48,13 +48,19 @@ except ImportError:
 			# Seriously wtf is wrong with you if you get this Exception.
 			raise Exception("Twython requires the simplejson library (or Python 2.6) to work. http://www.undefined.org/python/")
 
-# Detect if oauth2 supports the callback_url argument to request
-OAUTH_CLIENT_INSPECTION = inspect.getargspec(oauth.Client.request)
-try:
-	OAUTH_LIB_SUPPORTS_CALLBACK = 'callback_url' in OAUTH_CLIENT_INSPECTION.args	
-except AttributeError:
-	# Python 2.5 doesn't return named tuples, so don't look for an args section specifically.
-	OAUTH_LIB_SUPPORTS_CALLBACK = 'callback_url' in OAUTH_CLIENT_INSPECTION
+# Try and gauge the old OAuth2 library spec. Versions 1.5 and greater no longer have the callback
+# url as part of the request object; older versions we need to patch for Python 2.5... ugh. ;P
+OAUTH_CALLBACK_IN_URL = False
+OAUTH_LIB_SUPPORTS_CALLBACK = False
+if float(oauth._version.manual_verstr) <= 1.4:
+	OAUTH_CLIENT_INSPECTION = inspect.getargspec(oauth.Client.request)
+	try:
+		OAUTH_LIB_SUPPORTS_CALLBACK = 'callback_url' in OAUTH_CLIENT_INSPECTION.args	
+	except AttributeError:
+		# Python 2.5 doesn't return named tuples, so don't look for an args section specifically.
+		OAUTH_LIB_SUPPORTS_CALLBACK = 'callback_url' in OAUTH_CLIENT_INSPECTION
+else:
+	OAUTH_CALLBACK_IN_URL = True
 
 class TwythonError(AttributeError):
 	"""
@@ -214,7 +220,7 @@ class Twython(object):
 		
 		oauth_callback_confirmed = request_tokens.get('oauth_callback_confirmed')=='true'
 		
-		if not OAUTH_LIB_SUPPORTS_CALLBACK and callback_url!='oob' and oauth_callback_confirmed:
+		if not OAUTH_LIB_SUPPORTS_CALLBACK and callback_url != 'oob' and oauth_callback_confirmed:
 			import warnings
 			warnings.warn("oauth2 library doesn't support OAuth 1.0a type callback, but remote requires it") 
 			oauth_callback_confirmed = False
@@ -224,7 +230,7 @@ class Twython(object):
 		}
 		
 		# Use old-style callback argument
-		if callback_url!='oob' and not oauth_callback_confirmed:
+		if OAUTH_CALLBACK_IN_URL or (callback_url!='oob' and not oauth_callback_confirmed):
 			auth_url_params['oauth_callback'] = callback_url
 		
 		request_tokens['auth_url'] = self.authenticate_url + '?' + urllib.urlencode(auth_url_params)