diff --git a/dosagelib/decorators.py b/dosagelib/decorators.py
index ced98e702..76f5f7312 100644
--- a/dosagelib/decorators.py
+++ b/dosagelib/decorators.py
@@ -11,18 +11,18 @@ class memoized (object):
         self.func = func
         self.cache = {}
 
-    def __call__(self, *args):
+    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)
+            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)
+            return self.func(*args, **kwargs)
 
     def __repr__(self):
         """Return the function's docstring."""
diff --git a/dosagelib/util.py b/dosagelib/util.py
index e1f541ceb..573b0e6ae 100644
--- a/dosagelib/util.py
+++ b/dosagelib/util.py
@@ -203,13 +203,13 @@ def check_robotstxt(url, session):
     @raises: IOError if URL is not allowed
     """
     roboturl = get_roboturl(url)
-    rp = get_robotstxt_parser(roboturl, session)
+    rp = get_robotstxt_parser(roboturl, session=session)
     if not rp.can_fetch(UserAgent, url):
         raise IOError("%s is disallowed by robots.txt" % url)
 
 
 @memoized
-def get_robotstxt_parser(url, session):
+def get_robotstxt_parser(url, session=None):
     """Get a RobotFileParser for the given robots.txt URL."""
     rp = robotparser.RobotFileParser()
     req = urlopen(url, session, max_content_bytes=MaxContentBytes, raise_for_status=False)