diff --git a/simplest-sqlite.cabal b/simplest-sqlite.cabal
--- a/simplest-sqlite.cabal
+++ b/simplest-sqlite.cabal
@@ -2,7 +2,7 @@
 cabal-version: >= 1.10
 
 name: simplest-sqlite
-version: 0.1.1.0
+version: 0.1.1.1
 stability: Experimental
 author: YoshikuniJujo <PAF01143@nifty.ne.jp>
 maintainer: YoshikuniJujo <PAF01143@nifty.ne.jp>
diff --git a/src/Database/SmplstSQLite3.hs b/src/Database/SmplstSQLite3.hs
--- a/src/Database/SmplstSQLite3.hs
+++ b/src/Database/SmplstSQLite3.hs
@@ -127,8 +127,11 @@
 class Bindable a where bindN' :: Stmt -> Int -> a -> IO ()
 class Columnable a where column' :: Stmt -> Int -> IO a
 
-instance SQLiteData a => Bindable a where bindN' = bindN
-instance SQLiteData a => Columnable a where column' = column
+instance {-# OVERLAPPABLE #-} SQLiteData a => Bindable a where
+	bindN' = bindN
+
+instance {-# OVERLAPPABLE #-} SQLiteData a => Columnable a where
+	column' = column
 
 instance SQLiteData a => SQLiteData (Maybe a) where
 	bindN stmt i Nothing = sqlite3BindNull stmt i ()