diff --git a/roles/matrix.nix b/roles/matrix.nix
index 28b3271..90cec78 100644
--- a/roles/matrix.nix
+++ b/roles/matrix.nix
@@ -28,11 +28,10 @@
         type = "http";
         x_forwarded = true;
       } ];
+      max_upload_size = "100M";
       tls_certificate_path = "/var/lib/acme/synapse.mcwhirter.io/fullchain.pem";
       tls_private_key_path = "/var/lib/acme/synapse.mcwhirter.io/key.pem";
-      extraConfig = ''
-        max_upload_size: "100M"
-      '';
+      url_preview_enabled = true;
     };
 
     nginx = {