diff --git a/SJW.cabal b/SJW.cabal
index 58b7440..29ad179 100644
--- a/SJW.cabal
+++ b/SJW.cabal
@@ -35,3 +35,4 @@ executable sjw
                      , unix
   hs-source-dirs:      src
   default-language:    Haskell2010
+  ghc-options:         -Wall