diff --git a/haskell-cron-test.cabal b/haskell-cron-test.cabal
index 442e2f4..2e98e98 100644
--- a/haskell-cron-test.cabal
+++ b/haskell-cron-test.cabal
@@ -24,7 +24,7 @@ library
 executable haskell-cron-test-exe
   hs-source-dirs:      app
   main-is:             Main.hs
-  ghc-options:         -threaded -rtsopts -with-rtsopts=-N
+  ghc-options:         -threaded -rtsopts -with-rtsopts=-N -Wall -Werror
   build-depends:       base
                      , haskell-cron-test
   default-language:    Haskell2010
@@ -39,7 +39,7 @@ test-suite haskell-cron-test-test
                      , hspec
                      , QuickCheck
                      , haskell-cron-test
-  ghc-options:         -threaded -rtsopts -with-rtsopts=-N
+  ghc-options:         -threaded -rtsopts -with-rtsopts=-N  -Wall -Werror
   default-language:    Haskell2010
 
 source-repository head