diff --git a/roles/matrix-synapse/defaults/main.yml b/roles/matrix-synapse/defaults/main.yml
index 4e69ecd7..ce5235d3 100644
--- a/roles/matrix-synapse/defaults/main.yml
+++ b/roles/matrix-synapse/defaults/main.yml
@@ -580,6 +580,8 @@ matrix_synapse_default_room_version: "6"
 # If not, you can also control its value manually.
 matrix_synapse_spam_checker: []
 
+matrix_synapse_encryption_enabled_by_default_for_room_type: off
+
 matrix_synapse_trusted_key_servers:
   - server_name: "matrix.org"
 
diff --git a/roles/matrix-synapse/templates/synapse/homeserver.yaml.j2 b/roles/matrix-synapse/templates/synapse/homeserver.yaml.j2
index e384853c..5d7502fd 100644
--- a/roles/matrix-synapse/templates/synapse/homeserver.yaml.j2
+++ b/roles/matrix-synapse/templates/synapse/homeserver.yaml.j2
@@ -2651,7 +2651,7 @@ spam_checker: {{ matrix_synapse_spam_checker|to_json }}
 # Note that this option will only affect rooms created after it is set. It
 # will also not affect rooms created by other servers.
 #
-#encryption_enabled_by_default_for_room_type: invite
+encryption_enabled_by_default_for_room_type: {{ matrix_synapse_encryption_enabled_by_default_for_room_type|to_json }}
 
 
 # Uncomment to allow non-server-admin users to create groups on this server