case unsensitive path not working properly

git.cabal

@@ -23,7 +23,7 @@ Homepage:            https://github.com/vincenthz/hs-git
 tested-with:         GHC == 7.6.3, GHC == 7.8.4, GHC == 7.10.3, GHC == 8.0.1
 Cabal-Version:       >=1.8
 data-files:          README.md
-extra-source-files:  Tests/*.hs
+extra-source-files:  tests/*.hs
 
 Flag executable
   Description:       Build the executable