diff --git a/moe.cabal b/moe.cabal
--- a/moe.cabal
+++ b/moe.cabal
@@ -1,5 +1,5 @@
 Name:                 moe
-Version:              2014.11.17
+Version:              2015.5.4
 Build-type:           Simple
 Synopsis:             html with style
 Description:
@@ -10,7 +10,6 @@
 License-file:         LICENSE
 Author:               Jinjing Wang
 Maintainer:           Jinjing Wang <nfjinjing@gmail.com>
-Build-Depends:        base
 Cabal-version:        >= 1.2
 category:             Web
 homepage:             https://github.com/nfjinjing/moe
@@ -46,6 +45,3 @@
                       Text.HTML.Moe2.Utils
 
                       Text.HTML.Moe2.Backend.ByteString
-
-
-
diff --git a/src/Text/HTML/Moe2/Element.hs b/src/Text/HTML/Moe2/Element.hs
--- a/src/Text/HTML/Moe2/Element.hs
+++ b/src/Text/HTML/Moe2/Element.hs
@@ -75,5 +75,6 @@
 _pre x  = tell - singleton - Pre  (pack - escape x)
 prim x  = tell - singleton - Prim (pack x)
 
+raw_bytestring, prim_bytestring :: Internal -> MoeUnit
 raw_bytestring x   = tell - singleton - Raw  x
 prim_bytestring x  = tell - singleton - Prim x
