diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,3 +1,8 @@
+## 0.3.20
+
+* Generalize the type of `unChanLoggingT`
+  [#104](https://github.com/kazu-yamamoto/logger/pull/104)
+
 ## 0.3.19
 
 * Add CallStack-based functions and `Control.Monad.Logger.CallStack` module
diff --git a/Control/Monad/Logger.hs b/Control/Monad/Logger.hs
--- a/Control/Monad/Logger.hs
+++ b/Control/Monad/Logger.hs
@@ -654,7 +654,7 @@
 --   For use in a dedicated thread with a channel fed by `runChanLoggingT`.
 --
 -- @since 0.3.17
-unChanLoggingT :: (MonadLogger m, MonadIO m) => Chan (Loc, LogSource, LogLevel, LogStr) -> m ()
+unChanLoggingT :: (MonadLogger m, MonadIO m) => Chan (Loc, LogSource, LogLevel, LogStr) -> m void
 unChanLoggingT chan = forever $ do
     (loc,src,lvl,msg) <- liftIO $ readChan chan
     monadLoggerLog loc src lvl msg
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:             0.3.19
+version:             0.3.20
 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