diff --git a/unused.cabal b/unused.cabal
index 68231a7..5953e2d 100644
--- a/unused.cabal
+++ b/unused.cabal
@@ -45,7 +45,7 @@ library
 executable unused
   hs-source-dirs:      app
   main-is:             Main.hs
-  ghc-options:         -threaded -rtsopts -with-rtsopts=-N -Wall -Werror
+  ghc-options:         -threaded -rtsopts -with-rtsopts=-N -Wall -Werror -O2
   build-depends:       base
                      , unused
                      , optparse-applicative