diff --git a/dosagelib/decorators.py b/dosagelib/decorators.py
deleted file mode 100644
index 7ef1d2ac1..000000000
--- a/dosagelib/decorators.py
+++ /dev/null
@@ -1,30 +0,0 @@
-# -*- coding: iso-8859-1 -*-
-# Copyright (C) 2012-2014 Bastian Kleineidam
-
-class memoized (object):
-    """Decorator that caches a function's return value each time it is called.
-    If called later with the same arguments, the cached value is returned, and
-    not re-evaluated."""
-
-    def __init__(self, func):
-        """Store function and initialize the cache."""
-        self.func = func
-        self.cache = {}
-
-    def __call__(self, *args, **kwargs):
-        """Lookup and return cached result if found. Else call stored
-        function with given arguments."""
-        try:
-            return self.cache[args]
-        except KeyError:
-            self.cache[args] = value = self.func(*args, **kwargs)
-            return value
-        except TypeError:
-            # uncachable -- for instance, passing a list as an argument.
-            # Better to not cache than to blow up entirely.
-            return self.func(*args, **kwargs)
-
-    def __repr__(self):
-        """Return the function's docstring."""
-        return self.func.__doc__
-
diff --git a/dosagelib/util.py b/dosagelib/util.py
index fcaf5fcc4..1326ec088 100644
--- a/dosagelib/util.py
+++ b/dosagelib/util.py
@@ -21,7 +21,11 @@ import subprocess
 from six.moves.html_parser import HTMLParser
 import six
 
-from .decorators import memoized
+try:
+    from functools import lru_cache
+except ImportError:
+    from backports.functools_lru_cache import lru_cache
+
 from .output import out
 from .configuration import UserAgent, AppName, App, SupportUrl
 
@@ -247,7 +251,7 @@ def check_robotstxt(url, session):
         raise IOError("%s is disallowed by %s" % (url, roboturl))
 
 
-@memoized
+@lru_cache()
 def get_robotstxt_parser(url, session=None):
     """Get a RobotFileParser for the given robots.txt URL."""
     rp = RobotFileParser()
diff --git a/requirements.txt b/requirements.txt
index 91b62e435..4864f792b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,3 +4,4 @@ pbr
 requests>=2.0
 six
 backports.shutil_get_terminal_size; python_version<'3.3'
+backports.functools_lru_cache; python_version<'3.2'