diff --git a/novaclient/v1_1/usage.py b/novaclient/v1_1/usage.py
index b55f159..a99a75f 100644
--- a/novaclient/v1_1/usage.py
+++ b/novaclient/v1_1/usage.py
@@ -31,8 +31,7 @@ class UsageManager(base.ManagerWithFind):
         """
         return self._list(
                     "/os-simple-tenant-usage?start=%s&end=%s&detailed=%s" %
-                    (start.isoformat(), end.isoformat(), int(bool(detailed))),
-                    "tenant_usages")
+                    (start.isoformat(), end.isoformat(), int(bool(detailed))),)
 
     def get(self, tenant_id, start, end):
         """
@@ -44,5 +43,4 @@ class UsageManager(base.ManagerWithFind):
         :rtype: :class:`Usage`
         """
         return self._get("/os-simple-tenant-usage/%s?start=%s&end=%s" %
-                         (tenant_id, start.isoformat(), end.isoformat()),
-                         "tenant_usage")
+                         (tenant_id, start.isoformat(), end.isoformat()),)