diff --git a/templates/webhook/new/matrix.tmpl b/templates/webhook/new/matrix.tmpl
index 1850bab315..e8ba210187 100644
--- a/templates/webhook/new/matrix.tmpl
+++ b/templates/webhook/new/matrix.tmpl
@@ -12,7 +12,7 @@
 	</div>
 	<div class="required field {{if .Err_Room}}error{{end}}">
 		<label for="room_id">{{ctx.Locale.Tr "repo.settings.matrix.room_id"}}</label>
-		<input id="room_id" name="room_id" type="text" value="{{.HookMetadata.Room}}" placeholder="!opaque_id:domain" pattern="^!.+:.+$" maxlength="255" required>
+		<input id="room_id" name="room_id" type="text" value="{{.HookMetadata.Room}}" placeholder="!opaque_id" pattern="!.+" maxlength="255" required>
 		<span class="help">{{ctx.Locale.Tr "repo.settings.matrix.room_id_helper" ("<code>!opaque_id:example.org</code>"|SafeHTML)}}</span>
 	</div>
 	<div class="field">