diff --git a/nix/gitlab-ci/default.nix b/nix/gitlab-ci/default.nix
index 52f15fceab..fbc59b81a8 100644
--- a/nix/gitlab-ci/default.nix
+++ b/nix/gitlab-ci/default.nix
@@ -25,7 +25,7 @@ let
       script = [
         "nix run -f ./ third_party.nixpkgs.bash -c ./hack/populate_secrets.sh"
         "nix build -v -f ./ci-root.nix --substituters \"https://cache.nixos.org/ s3://lukegb-nix-cache?endpoint=storage.googleapis.com&trusted=1\""
-        "nix run -f ./ go.nix.bcacheup -c bcacheup --cache_url gs://lukegb-nix-cache ./result"
+        "GOOGLE_APPLICATION_CREDENTIALS=$HOME/sa.json nix run -f ./ go.nix.bcacheup -c bcacheup --cache_url gs://lukegb-nix-cache ./result"
         "cat ./result/other-systemPathJSON > systems.json"
       ];
       artifacts = {