diff --git a/modules/services/borgmatic/default.nix b/modules/services/borgmatic/default.nix
index 309b852..7b44817 100644
--- a/modules/services/borgmatic/default.nix
+++ b/modules/services/borgmatic/default.nix
@@ -45,8 +45,15 @@ in {
       };
     };
 
+    services.postgresql.ensureUsers = [
+      {
+        name = "root";
+        ensureClauses.superuser = true;
+      }
+    ];
+
     # Add `pg_dumpall` to unit environment
-    systemd.services.borgmatic.path = [ pkgs.postgresql ];
+    systemd.services.borgmatic.path = [ config.services.postgresql.package ];
 
     # Without this override, `cat` is unavailable for `encryption_passcommand`
     systemd.services.borgmatic.confinement.fullUnit = true;