diff --git a/semantic-diff.cabal b/semantic-diff.cabal
index c3f1fb517..6d1585e8a 100644
--- a/semantic-diff.cabal
+++ b/semantic-diff.cabal
@@ -89,7 +89,8 @@ executable semantic-diff-exe
 executable semantic-diff
   hs-source-dirs:      app
   main-is:             SemanticDiff.hs
-  other-modules:       Parsers
+  other-modules:       DiffOutput
+                     , Parsers
   if os(darwin)
     ghc-options:       -threaded -rtsopts -with-rtsopts=-N -static -j
   else