diff --git a/roles/matrix-bridge-mx-puppet-slack/defaults/main.yml b/roles/matrix-bridge-mx-puppet-slack/defaults/main.yml
index 13aa5b7a..6acfb714 100644
--- a/roles/matrix-bridge-mx-puppet-slack/defaults/main.yml
+++ b/roles/matrix-bridge-mx-puppet-slack/defaults/main.yml
@@ -52,6 +52,9 @@ matrix_mx_puppet_slack_systemd_wanted_services_list: []
 matrix_mx_puppet_slack_appservice_token: ''
 matrix_mx_puppet_slack_homeserver_token: ''
 
+# Can be set to enable automatic double-puppeting via Shared Secret Auth (https://github.com/devture/matrix-synapse-shared-secret-auth).
+matrix_mx_puppet_slack_login_shared_secret: ''
+
 # Default configuration template which covers the generic use case.
 # You can customize it by controlling the various variables inside it.
 #
diff --git a/roles/matrix-bridge-mx-puppet-slack/templates/config.yaml.j2 b/roles/matrix-bridge-mx-puppet-slack/templates/config.yaml.j2
index bcf4e2d1..b6e88784 100644
--- a/roles/matrix-bridge-mx-puppet-slack/templates/config.yaml.j2
+++ b/roles/matrix-bridge-mx-puppet-slack/templates/config.yaml.j2
@@ -9,6 +9,10 @@ bridge:
   domain: {{ matrix_mx_puppet_slack_homeserver_domain }}
   # Reachable URL of the Matrix homeserver
   homeserverUrl: {{ matrix_mx_puppet_slack_homeserver_address }}
+  {% if matrix_mx_puppet_slack_login_shared_secret != '' %}
+  loginSharedSecretMap:
+    {{ matrix_domain }}: {{ matrix_mx_puppet_slack_login_shared_secret }}
+  {% endif %}
 
 
 # Slack OAuth settings. Create a slack app at https://api.slack.com/apps