diff --git a/FWGL.hs b/FWGL.hs
--- a/FWGL.hs
+++ b/FWGL.hs
@@ -73,6 +73,7 @@
 
 import Data.IORef
 import qualified Data.HashMap.Strict as H
+import Control.Applicative
 import Control.Concurrent
 import Control.Monad
 import Control.Monad.IO.Class
diff --git a/fwgl.cabal b/fwgl.cabal
--- a/fwgl.cabal
+++ b/fwgl.cabal
@@ -1,5 +1,5 @@
 name:                fwgl
-version:             0.1.3.0
+version:             0.1.3.1
 synopsis:            Game engine
 description:         FWGL is a library for interactive 2D and 3D applications and games. It provides a purely functional interface for advanced graphics programming, including a type safe embedded DSL for GPU programming. You are not required to know or use OpenGL directly to work with FWGL, you just need a basic knowledge of what vertex/fragment shaders, uniforms and attributes are (if you are going to make a more advanced use of it). FWGL is aimed at functional reactive programming (with Yampa), but provides a non-reactive interface as well. There are two backends: fwgl-glfw and fwgl-javascript.
 homepage:            https://github.com/ziocroc/FWGL