diff --git a/nixbld-etc-nixos/backup-module.nix b/nixbld-etc-nixos/backup-module.nix
index dbc837f..e95c7d5 100644
--- a/nixbld-etc-nixos/backup-module.nix
+++ b/nixbld-etc-nixos/backup-module.nix
@@ -12,7 +12,7 @@ let
     DBDUMPDIR=`mktemp -d`
     pushd $DBDUMPDIR
 
-    ${config.services.mysql.package}/bin/mysqldump --single-transaction flarum > flarum.sql
+    ${config.services.mysql.package}/bin/mysqldump --user=root --single-transaction flarum > flarum.sql
     ${pkgs.sudo}/bin/sudo -u mattermost ${config.services.postgresql.package}/bin/pg_dump mattermost > mattermost.sql
     ${pkgs.sudo}/bin/sudo -u rt ${config.services.postgresql.package}/bin/pg_dump rt5 > rt.sql