diff --git a/vty-unix.cabal b/vty-unix.cabal
index bada4b1..43a502a 100644
--- a/vty-unix.cabal
+++ b/vty-unix.cabal
@@ -17,8 +17,8 @@ library
     import:           warnings
     hs-source-dirs:   src
     default-language: Haskell2010
+    includes:         cbits/gwinsz.h
     c-sources:        cbits/set_term_timing.c
-                      cbits/gwinsz.h
                       cbits/gwinsz.c
     exposed-modules:  Data.Terminfo.Eval
                       Data.Terminfo.Parse