diff --git a/go/nix/bcacheup/bcacheup.go b/go/nix/bcacheup/bcacheup.go
index e975939dac..370a38b29a 100644
--- a/go/nix/bcacheup/bcacheup.go
+++ b/go/nix/bcacheup/bcacheup.go
@@ -31,6 +31,7 @@ import (
 
 var (
 	blobURLFlag = flag.String("cache_url", "", "Cache URL")
+	storeDBFlag = flag.String("nix_store_db", nixstore.DefaultStoreDB, "Path to the nix store database")
 )
 
 var (
@@ -419,7 +420,7 @@ func main() {
 	}
 	defer bucket.Close()
 
-	store, err := nixstore.Open(nixstore.DefaultStoreDB)
+	store, err := nixstore.Open(*storeDBFlag)
 	if err != nil {
 		log.Fatalf("opening Nix store: %v", err)
 	}
diff --git a/nix/gitlab-ci/default.nix b/nix/gitlab-ci/default.nix
index fbc59b81a8..cb657d997d 100644
--- a/nix/gitlab-ci/default.nix
+++ b/nix/gitlab-ci/default.nix
@@ -25,7 +25,8 @@ 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\""
-        "GOOGLE_APPLICATION_CREDENTIALS=$HOME/sa.json nix run -f ./ go.nix.bcacheup -c bcacheup --cache_url gs://lukegb-nix-cache ./result"
+        "cp /nix/var/nix/db/db.sqlite db.sqlite"
+        "GOOGLE_APPLICATION_CREDENTIALS=$HOME/sa.json nix run -f ./ go.nix.bcacheup -c bcacheup --cache_url gs://lukegb-nix-cache --nix_store_db ./db.sqlite ./result"
         "cat ./result/other-systemPathJSON > systems.json"
       ];
       artifacts = {