diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 78c9387026..4cd1f4d39b 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -11,7 +11,7 @@ nixCache:
   image: "nixos/nix:latest"
   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 build -v -f ./ci-root.nix --substituters \"https://cache.nixos.org/ s3://lukegb-nix-cache?endpoint=storage.googleapis.com&trusted=1\""
     - "nix copy -v --to 's3://lukegb-nix-cache?endpoint=storage.googleapis.com' ./result"
   tags:
     - cacher