diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,3 +1,7 @@
+## 0.3.20.2
+
+* Support for GHC 8.2
+
 ## 0.3.20.1
 
 * Fix #106 by correcting the default signature for MonadLoggerIO [#108](https://github.com/kazu-yamamoto/logger/pull/108)
diff --git a/Control/Monad/Logger.hs b/Control/Monad/Logger.hs
--- a/Control/Monad/Logger.hs
+++ b/Control/Monad/Logger.hs
@@ -200,8 +200,8 @@
 -- | A @Monad@ which has the ability to log messages in some manner.
 class Monad m => MonadLogger m where
     monadLoggerLog :: ToLogStr msg => Loc -> LogSource -> LogLevel -> msg -> m ()
-    default monadLoggerLog :: (Trans.MonadTrans t, MonadLogger (t m), ToLogStr msg)
-                           => Loc -> LogSource -> LogLevel -> msg -> t m ()
+    default monadLoggerLog :: (MonadLogger m', Trans.MonadTrans t, MonadLogger (t m'), ToLogStr msg, m ~ t m')
+                           => Loc -> LogSource -> LogLevel -> msg -> m ()
     monadLoggerLog loc src lvl msg = Trans.lift $ monadLoggerLog loc src lvl msg
 
 -- | An extension of @MonadLogger@ for the common case where the logging action
diff --git a/monad-logger.cabal b/monad-logger.cabal
--- a/monad-logger.cabal
+++ b/monad-logger.cabal
@@ -1,5 +1,5 @@
 name:                monad-logger
-version:             0.3.20.1
+version:             0.3.20.2
 synopsis:            A class of monads which can log messages.
 description:         Hackage documentation generation is not reliable. For up to date documentation, please see: <http://www.stackage.org/package/monad-logger>.
 homepage:            https://github.com/kazu-yamamoto/logger