diff --git a/png-chunk-yaftee.cabal b/png-chunk-yaftee.cabal
--- a/png-chunk-yaftee.cabal
+++ b/png-chunk-yaftee.cabal
@@ -5,7 +5,7 @@
 -- see: https://github.com/sol/hpack
 
 name:           png-chunk-yaftee
-version:        0.1.0.1
+version:        0.1.0.2
 synopsis:       PNG's chunk codec on Yaftee
 description:    Please see the README on GitHub at <https://github.com/YoshikuniJujo/png-chunk-yaftee#readme>
 category:       Codec,Graphics,Image
diff --git a/src/Control/Monad/Yaftee/Pipe/Png/Chunk.hs b/src/Control/Monad/Yaftee/Pipe/Png/Chunk.hs
--- a/src/Control/Monad/Yaftee/Pipe/Png/Chunk.hs
+++ b/src/Control/Monad/Yaftee/Pipe/Png/Chunk.hs
@@ -53,8 +53,7 @@
 
 import Numeric
 
-decodeRun_ ::
-	F.Loose (U.U es) =>
+decodeRun_ :: forall nm es i o r . F.Loose (U.U es) =>
 	Eff.E (DecodeStates nm `Append` es) i o r -> Eff.E es i o ()
 decodeRun_ = void . (`State.runN` Crc32.initial)