diff --git a/.travis.yml b/.travis.yml
index a912fe6..44bbe9b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,6 +7,11 @@ before_script:
   - mkdir -m 0755 -p /nix/var/nix/{profiles,gcroots}/per-user/$USER
   - mkdir -p ~/.config/nixpkgs
 
+matrix:
+  include:
+  - env:
+    - NIXPKGS=https://github.com/NixOS/nixpkgs-channels/archive/nixos-18.09.tar.gz
+
 script:
   # - nix run nixpkgs.haskellPackages.hlint -c hlint src
-  - nix build ./release.nix -A xmonad-masser
+  - nix build -I nixpkgs=$NIXPKGS ./release.nix -A xmonad-masser