diff --git a/app/assets/javascripts/discourse/templates/components/composer-user-selector.hbs b/app/assets/javascripts/discourse/templates/components/composer-user-selector.hbs
index 3e5d25059e6..402416a1d6e 100644
--- a/app/assets/javascripts/discourse/templates/components/composer-user-selector.hbs
+++ b/app/assets/javascripts/discourse/templates/components/composer-user-selector.hbs
@@ -7,7 +7,8 @@
                   placeholderKey="composer.users_placeholder"
                   tabindex="1"
                   usernames=usernames
-                  hasGroups=hasGroups}}
+                  hasGroups=hasGroups
+                  autocomplete="off"}}
 {{else}}
   <div class='ac-wrap composer-user-selector-limited' {{action "toggleSelector"}}>
     <span>{{limitedUsernames}}</span>