diff --git a/roles/custom/matrix-authentication-service/tasks/syn2mas.yml b/roles/custom/matrix-authentication-service/tasks/syn2mas.yml
index 7887821a4..46ae2688c 100644
--- a/roles/custom/matrix-authentication-service/tasks/syn2mas.yml
+++ b/roles/custom/matrix-authentication-service/tasks/syn2mas.yml
@@ -97,6 +97,7 @@
       --command=migrate
       --synapseConfigFile=/homeserver.yaml
       --masConfigFile=/mas-config.yaml
+      {{ matrix_authentication_service_syn2mas_process_extra_arguments | join(' ') }}
       {% if matrix_authentication_service_syn2mas_dry_run | bool %}--dryRun{% endif %}
   tags:
     - skip_ansible_lint