diff --git a/pkgs/development/libraries/haskell/xtest/default.nix b/pkgs/development/libraries/haskell/xtest/default.nix
index 6af22abedc0f..d9ce47647cad 100644
--- a/pkgs/development/libraries/haskell/xtest/default.nix
+++ b/pkgs/development/libraries/haskell/xtest/default.nix
@@ -1,4 +1,4 @@
-{ cabal, X11, libXtst }:
+{ cabal, libXtst, X11 }:
 
 cabal.mkDerivation (self: {
   pname = "xtest";