diff --git a/ghc-mod.cabal b/ghc-mod.cabal
index a595289..d0f28d9 100644
--- a/ghc-mod.cabal
+++ b/ghc-mod.cabal
@@ -270,7 +270,7 @@ Test-Suite spec
                         ConstraintKinds, FlexibleContexts,
                         DataKinds, KindSignatures, TypeOperators, ViewPatterns
   Main-Is:              Main.hs
-  Hs-Source-Dirs:       test, ., src
+  Hs-Source-Dirs:       test, ., src, core
   Ghc-Options:          -Wall -fno-warn-deprecations -threaded
   CPP-Options:          -DSPEC=1
   Type:                 exitcode-stdio-1.0