diff --git a/global-config.cabal b/global-config.cabal
--- a/global-config.cabal
+++ b/global-config.cabal
@@ -1,5 +1,5 @@
 name:           global-config
-version:        0.2.0
+version:        0.2.1
 cabal-version:  >= 1.8
 build-type:     Simple
 author:         Alexander Dorofeev <aka.spin@gmail.com>spin
diff --git a/src/Data/Global/Config.hs b/src/Data/Global/Config.hs
--- a/src/Data/Global/Config.hs
+++ b/src/Data/Global/Config.hs
@@ -55,6 +55,7 @@
     
     -- | Set config handler
     onSetConfig :: a -> IO ()
+    onSetConfig _ = return ()
     
     -- | Get global config
     getConfig :: IO a