diff --git a/scripts/post-build-hook b/scripts/post-build-hook
index d976eaa..66ab7ad 100755
--- a/scripts/post-build-hook
+++ b/scripts/post-build-hook
@@ -1,9 +1,6 @@
 #!/bin/sh
 set -euf
 export IFS=' '
-nix-store -r $DRV_PATH
-for f in $DRV_PATH $OUT_PATHS; do
-  nix store sign --key-file $HOME/cache.key $f
-  nix copy --to "s3://cache-chir-rs?scheme=https&endpoint=s3.us-west-000.backblazeb2.com&secret-key=$HOME/cache.key&multipart-upload=true&compression=zstd&compression-level=15" $f
-done
+nix store sign --key-file $HOME/cache.key $DRV_PATH
+nix copy --to "s3://cache-chir-rs?scheme=https&endpoint=s3.us-west-000.backblazeb2.com&secret-key=$HOME/cache.key&multipart-upload=true&compression=zstd&compression-level=15" $DRV_PATH