diff --git a/.travis.yml b/.travis.yml
index 22e0e56..fe9e2d1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,5 @@
 language: nix
 script:
+    - git clone --depth 1 https://github.com/NixOS/nixpkgs ../nixpkgs
     - nix-build tests/intern.nix
     - nix-build tests/extern.nix