diff --git a/lib/cli/options/matrix.js b/lib/cli/options/matrix.js
index 06169519e8..8896c68c6e 100644
--- a/lib/cli/options/matrix.js
+++ b/lib/cli/options/matrix.js
@@ -25,7 +25,7 @@ export function addOptions(yargs) {
     .option('matrix.rooms', {
       describe:
         'Send messages to different rooms. Current message types are [' +
-        matrixMessageTypes +
+        matrixMessageTypes() +
         ']. If you want to send error messages to a specific room use --matrix.rooms.error ROOM',
       group: 'Matrix'
     });