diff --git a/dosagelib/util.py b/dosagelib/util.py
index 37e90aa5a..9b80468d6 100644
--- a/dosagelib/util.py
+++ b/dosagelib/util.py
@@ -289,7 +289,7 @@ def check_robotstxt(url, session):
     """
     roboturl = get_roboturl(url)
     rp = get_robotstxt_parser(roboturl, session=session)
-    if not rp.can_fetch(UserAgent, url):
+    if not rp.can_fetch(UserAgent, str(url)):
         raise IOError("%s is disallowed by robots.txt" % url)