@@ -12,7 +12,7 @@ import Control.Concurrent
1212import Control.DeepSeq
1313import Criterion.Main
1414import Data.Aeson
15−import Data.Monoid
15+import Data.Monoid as M
1616import Data.Time.Calendar
1717import Data.Time.Clock
1818import System.IO
@@ -63,7 +63,7 @@ exItem tid = Item {
6363data ExPayload = ExPayload
6464
6565instance ToJSON ExPayload where
66− toJSON _ = Object mempty
66+ toJSON _ = Object M.mempty
6767
6868instance ToObject ExPayload
6969