diff --git a/ghc-mod.cabal b/ghc-mod.cabal
index 357f55e..105a1f5 100644
--- a/ghc-mod.cabal
+++ b/ghc-mod.cabal
@@ -82,6 +82,8 @@ Extra-Source-Files:     ChangeLog
                         test/data/cabal-preprocessors/*.hs
                         test/data/cabal-preprocessors/*.hsc
                         test/data/file-mapping/*.hs
+                        test/data/file-mapping/preprocessor/*.hs
+                        test/data/file-mapping/lhs/*.lhs
 
 Library
   Default-Language:     Haskell2010