diff --git a/roles/matrix-bridge-mautrix-twitter/tasks/validate_config.yml b/roles/matrix-bridge-mautrix-twitter/tasks/validate_config.yml
index 4c95f7bf..1c2a52d4 100644
--- a/roles/matrix-bridge-mautrix-twitter/tasks/validate_config.yml
+++ b/roles/matrix-bridge-mautrix-twitter/tasks/validate_config.yml
@@ -8,3 +8,11 @@
   with_items:
     - "matrix_mautrix_twitter_appservice_token"
     - "matrix_mautrix_twitter_homeserver_token"
+
+- name: Fail if required settings not defined
+  fail:
+    msg: >-
+      You need to define a need to set `matrix_mautrix_twitter_database_engine: postgres` and redefine the other `matrix_mautrix_twitter_database_*` variables
+  when: "vars[item] == ''"
+  with_items:
+    - "matrix_mautrix_twitter_database_engine"