diff --git a/group_vars/matrix_servers b/group_vars/matrix_servers
index dabe0d756..6111600e5 100755
--- a/group_vars/matrix_servers
+++ b/group_vars/matrix_servers
@@ -129,7 +129,7 @@ matrix_appservice_slack_systemd_required_services_list: |
   }}
 
 # Postgres is the default, except if not using `matrix_postgres` (internal postgres)
-matrix_appservice_slack_database_engine: "{{ 'postgres' if matrix_postgres_enabled else 'sqlite' }}"
+matrix_appservice_slack_database_engine: "{{ 'postgres' if matrix_postgres_enabled else 'nedb' }}"
 matrix_appservice_slack_database_password: "{{ matrix_synapse_macaroon_secret_key | password_hash('sha512', 'as.slack.db') | to_uuid }}"
 
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