diff --git a/yesod-core/Yesod/Core.hs b/yesod-core/Yesod/Core.hs
index 8beedc72..661d8ec6 100644
--- a/yesod-core/Yesod/Core.hs
+++ b/yesod-core/Yesod/Core.hs
@@ -57,7 +57,7 @@ import Yesod.Request
 import Yesod.Widget
 import Yesod.Message
 
-import System.Log.FastLogger
+import Control.Monad.Logger
 
 -- | Return an 'Unauthorized' value, with the given i18n message.
 unauthorizedI :: RenderMessage master msg => msg -> GHandler sub master AuthResult
diff --git a/yesod-core/Yesod/Handler.hs b/yesod-core/Yesod/Handler.hs
index b519dfae..04688af4 100644
--- a/yesod-core/Yesod/Handler.hs
+++ b/yesod-core/Yesod/Handler.hs
@@ -165,6 +165,7 @@ import Text.Blaze.Html (toHtml, preEscapedToMarkup)
 #define preEscapedText preEscapedToMarkup
 
 import System.Log.FastLogger
+import Control.Monad.Logger
 
 import qualified Yesod.Internal.Cache as Cache
 import Yesod.Internal.Cache (mkCacheKey, CacheKey)
@@ -957,7 +958,7 @@ instance MonadResource (GHandler sub master) where
     release = lift . release
     resourceMask = lift . resourceMask
 
-instance MonadLogging (GHandler sub master) where
-    monadLoggingLog a b c = do
+instance MonadLogger (GHandler sub master) where
+    monadLoggerLog a b c = do
         hd <- ask
         liftIO $ handlerLog hd a b (toLogStr c)
diff --git a/yesod-core/Yesod/Internal/Core.hs b/yesod-core/Yesod/Internal/Core.hs
index 11791592..2335dca2 100644
--- a/yesod-core/Yesod/Internal/Core.hs
+++ b/yesod-core/Yesod/Internal/Core.hs
@@ -86,7 +86,8 @@ import Network.Wai.Middleware.Gzip (GzipSettings, def)
 import Network.Wai.Parse (tempFileSink, lbsSink)
 import qualified Paths_yesod_core
 import Data.Version (showVersion)
-import System.Log.FastLogger (LogLevel (LevelInfo), Logger, mkLogger, loggerDateRef, LogStr (..), loggerPutStr)
+import System.Log.FastLogger (Logger, mkLogger, loggerDateRef, LogStr (..), loggerPutStr)
+import Control.Monad.Logger (LogLevel (LevelInfo, LevelOther))
 import System.Log.FastLogger.Date (getDate, DateRef)
 import System.IO (stdout)
 
@@ -352,7 +353,10 @@ formatLogMessage dateref loc level msg = do
     return
         [ LB now
         , LB " ["
-        , LS $ drop 5 $ show level
+        , LS $
+            case level of
+                LevelOther t -> T.unpack t
+                _ -> drop 5 $ show level
         , LB "] "
         , msg
         , LB " @("
diff --git a/yesod-core/Yesod/Widget.hs b/yesod-core/Yesod/Widget.hs
index 9c3cb69e..e6a27cc3 100644
--- a/yesod-core/Yesod/Widget.hs
+++ b/yesod-core/Yesod/Widget.hs
@@ -87,7 +87,7 @@ import Control.Monad.Base (MonadBase (liftBase))
 import Control.Arrow (first)
 import Control.Monad.Trans.Resource
 
-import System.Log.FastLogger
+import Control.Monad.Logger
 
 preEscapedLazyText :: TL.Text -> Html
 preEscapedLazyText = preEscapedToMarkup
@@ -345,5 +345,5 @@ instance MonadResource (GWidget sub master) where
     release = lift . release
     resourceMask = lift . resourceMask
 
-instance MonadLogging (GWidget sub master) where
-    monadLoggingLog a b = lift . monadLoggingLog a b
+instance MonadLogger (GWidget sub master) where
+    monadLoggerLog a b = lift . monadLoggerLog a b
diff --git a/yesod-core/yesod-core.cabal b/yesod-core/yesod-core.cabal
index 756632dc..0a8fa555 100644
--- a/yesod-core/yesod-core.cabal
+++ b/yesod-core/yesod-core.cabal
@@ -78,6 +78,7 @@ library
                    , vector                >= 0.9      && < 0.10
                    , aeson                 >= 0.5
                    , fast-logger           >= 0.1      && < 0.2
+                   , monad-logger          >= 0.0      && < 0.1
                    , conduit               >= 0.5      && < 0.6
                    , resourcet             >= 0.3      && < 0.4
                    , lifted-base           >= 0.1      && < 0.2