diff --git a/pyghmi/redfish/command.py b/pyghmi/redfish/command.py
index 7a8d732e..aa0cdd5f 100644
--- a/pyghmi/redfish/command.py
+++ b/pyghmi/redfish/command.py
@@ -533,7 +533,7 @@ class Command(object):
                 msgid = ','.join(msgid)
                 raise exc.RedfishError(errmsg, msgid=msgid)
             except (ValueError, KeyError):
-                raise exc.PyghmiException(str(url) + ":" + res[0])
+                raise exc.PyghmiException(str(url) + ":" + str(res[0]))
         if payload is None and method is None:
             self._urlcache[url] = {'contents': res[0],
                                    'vintage': os.times()[4]}