diff --git a/letsacme.py b/letsacme.py
index 0ab3b6f3..d8310974 100644
--- a/letsacme.py
+++ b/letsacme.py
@@ -206,7 +206,7 @@ def _send_signed_request(url, payload):
             resp = urlopen(url, data.encode('utf8'))
             return resp.getcode(), resp.read(), resp.info()
         except IOError as err:
-            return getattr(err, "code", None), getattr(err, "read", err.__str__),\
+            return getattr(err, "code", None), getattr(err, "read", err.__str__)(),\
                            getattr(err, "info", None)()
 
     crt_info = set([])