diff --git a/modules/system/backups.nix b/modules/system/backups.nix
index 815be8b..e31ae83 100644
--- a/modules/system/backups.nix
+++ b/modules/system/backups.nix
@@ -51,7 +51,7 @@ in
         # the actual script borg is using
         ExecStart = pkgs.writeShellScript "borg-backup" ''
           set -euo pipefail
-          export BORG_PASSPHRASE="$(cat ${passwd_file})"
+          export BORG_PASSPHRASE="$(cat ${cfg.passwd_file})"
           export BORG_REPO="${cfg.repo}"
           timestamp="$(date +'%Y-%m-%d_%H:%M:%S')"