diff --git a/XMonadContrib.cabal b/XMonadContrib.cabal
index 141e1223..33b12145 100644
--- a/XMonadContrib.cabal
+++ b/XMonadContrib.cabal
@@ -25,7 +25,7 @@ library
         build-depends: base < 3
 
     build-depends:      mtl, unix, X11==1.3.0, xmonad==0.4
-    ghc-options:        -Wall
+    ghc-options:        -Wall -Werror
     exposed-modules:    XMonad.Actions.Commands
                         XMonad.Actions.ConstrainedResize
                         XMonad.Actions.CopyWindow