diff --git a/.travis.yml b/.travis.yml
index eace0ae15..fbccf99f2 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,5 @@
 language: nix
+nix: 2.2.2
 env:
   - NIX_PATH="nixpkgs=${TRAVIS_BUILD_DIR}"
 before_script: