diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -1,5 +1,7 @@
 # Nondeterminism
 
+[![Build Status](http://circleci-badges-max.herokuapp.com/img/abarbu/nondeterminism-haskell/master?token=345e81d04c8b8609c50124632f8d1b594f476cb5)](https://circleci.com/gh/abarbu/nondeterminism-haskell/tree/master)
+
 This package is available via [Hackage where its documentation resides](https://hackage.haskell.org/package/nondeterminism).
 
 This provides nondeterministic computations in Haskell. It implements
diff --git a/nondeterminism.cabal b/nondeterminism.cabal
--- a/nondeterminism.cabal
+++ b/nondeterminism.cabal
@@ -1,5 +1,5 @@
 Name:                nondeterminism
-Version:             1.4
+Version:             1.5
 Description:         Nondeterministic computations
 License:             LGPL
 License-file:        LICENSE
diff --git a/src/Control/Monad/Amb.hs b/src/Control/Monad/Amb.hs
--- a/src/Control/Monad/Amb.hs
+++ b/src/Control/Monad/Amb.hs
@@ -42,6 +42,7 @@
 import Control.Monad.Cont
 import Control.Monad.State.Lazy
 import Control.Monad.Identity
+import Control.Monad
 import Control.Applicative
 #if __GLASGOW_HASKELL__ < 709
 import Data.Monoid