diff --git a/cipola.cabal b/cipola.cabal
index 2451c53..079598e 100644
--- a/cipola.cabal
+++ b/cipola.cabal
@@ -78,7 +78,7 @@ library
   -- Base language which the package is written in.
   default-language:    Haskell2010
 
-  ghc-options:         -Wall
+  ghc-options:         -Wall -Werror
 
 test-suite cipola-test
   type: exitcode-stdio-1.0
@@ -103,13 +103,13 @@ test-suite cipola-test
                        Test.PrimeVectorSpec
                        Test.PrimeVector.Util
   default-language: Haskell2010
-  ghc-options: -Wall
+  ghc-options: -Wall -Werror
 
 executable factorize
   main-is: Main.hs
   hs-source-dirs:
     factorize
-  ghc-options: -threaded -rtsopts -with-rtsopts=-N -Wall
+  ghc-options: -threaded -rtsopts -with-rtsopts=-N -Wall -Werror
   build-depends:
       base
     , cipola