diff --git a/avr-shake.cabal b/avr-shake.cabal
--- a/avr-shake.cabal
+++ b/avr-shake.cabal
@@ -1,5 +1,5 @@
 name:                   avr-shake
-version:                0.0.1.1
+version:                0.0.1.2
 stability:              experimental
 
 cabal-version:          >= 1.6
@@ -24,7 +24,7 @@
   exposed-modules:      Development.Shake.AVR
                         System.Command.AVRDUDE
   build-depends:        base >= 3 && <5,
-                        dependent-sum,
+                        dependent-sum == 0.2.*,
                         mtl,
                         process,
                         shake >= 0.10
diff --git a/src/System/Command/AVRDUDE.hs b/src/System/Command/AVRDUDE.hs
--- a/src/System/Command/AVRDUDE.hs
+++ b/src/System/Command/AVRDUDE.hs
@@ -20,7 +20,6 @@
 import Control.Monad.Writer
 import Data.GADT.Compare
 import Data.List
-import Data.Monoid
 import Data.Word
 import System.Exit
 import System.Process