diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index fad10bc094..f8538364d8 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -4,7 +4,7 @@ nixCache:
     - "mkdir -p ops/secrets"
     - "cp ${OPS_SECRETS_DEFAULT_NIX} ops/secrets/default.nix"
     - "test -d cache || mkdir cache"
-    - "nix-build ./ci-root.nix --option extra-substituters \"s3://lukegb-nix-cache?endpoint=storage.googleapis.com&trusted=1 file://$PWD/cache?trusted=1\""
+    - "nix-build ./ci-root.nix --option substituters \"file://$PWD/cache?trusted=1 https://cache.nixos.org s3://lukegb-nix-cache?endpoint=storage.googleapis.com&trusted=1\""
     - "nix copy --to 'file://cache' -f ./ci-root.nix"
     - "nix copy --to 's3://lukegb-nix-cache?endpoint=storage.googleapis.com' -f ./ci-root.nix"
   cache: