diff --git a/web/src/compose.js b/web/src/compose.js
index 34391e1653..e36d6d5f2a 100644
--- a/web/src/compose.js
+++ b/web/src/compose.js
@@ -786,6 +786,10 @@ export function initialize() {
         compose_recipient.update_placeholder_text();
     });
 
+    $("#stream_message_recipient_topic").on("input", () => {
+        compose_recipient.update_placeholder_text();
+    });
+
     $("body").on("click", ".formatting_button", (e) => {
         const $compose_click_target = $(compose_ui.get_compose_click_target(e));
         const $textarea = $compose_click_target.closest("form").find("textarea");