diff --git a/ci/upload-to-cache.sh b/ci/upload-to-cache.sh
index c72c0a2..6e348a7 100755
--- a/ci/upload-to-cache.sh
+++ b/ci/upload-to-cache.sh
@@ -6,4 +6,4 @@ set -f # disable globbing
 export IFS=' '
 echo "Uploading paths" $OUT_PATHS
 # this is where the cachix installer installs nix
-exec /nix/var/nix/profiles/default/bin/nix copy --to "s3://nixcache" $OUT_PATHS
+exec /nix/var/nix/profiles/default/bin/nix copy --to "s3://nixcache?endpoint=s3.cy7.sh" $OUT_PATHS