diff --git a/.travis.yml b/.travis.yml

index a82875bd1f8b7a28849df94149c797566c20123d..964d8d468062140fa0f95b7d67df38fe213e29b4 100644

--- a/.travis.yml

+++ b/.travis.yml

@@ -14,6 +14,14 @@ - env: NIX_CHANNEL=https://nixos.org/channels/nixpkgs-unstable

 - env: NIX_CHANNEL=https://nixos.org/channels/nixos-unstable

 - env: NIX_CHANNEL=https://nixos.org/channels/nixos-20.03

+cache:

• directories:

• • $HOME/nix.store

+before_cache:

• • mkdir -p $HOME/nix.store

• • nix copy --to file://$HOME/nix.store

before_install:

• sudo mkdir -p /etc/nix

• echo "trusted-users = root $USER" | sudo tee -a /etc/nix/nix.conf