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 99fc0a5b97d..0722426f163 100644
--- a/app/assets/javascripts/discourse/templates/components/composer-user-selector.hbs
+++ b/app/assets/javascripts/discourse/templates/components/composer-user-selector.hbs
@@ -3,7 +3,6 @@
                   onChangeCallback='triggerResize'
                   id="private-message-users"
                   includeMessageableGroups='true'
-                  class="span8"
                   placeholderKey="composer.users_placeholder"
                   tabindex="1"
                   usernames=usernames
diff --git a/app/assets/stylesheets/desktop/compose.scss b/app/assets/stylesheets/desktop/compose.scss
index d7fc0fb05f5..00e4a9f85a9 100644
--- a/app/assets/stylesheets/desktop/compose.scss
+++ b/app/assets/stylesheets/desktop/compose.scss
@@ -10,10 +10,14 @@
       align-items: center;
     }
   }
+
+  #private-message-users {
+    width: 404px;
+  }
 }
 
 .category-input {
-  margin-left: 10px;  
+  margin-left: 10px;
 }
 
 .edit-title {
@@ -27,7 +31,7 @@
       }
     }
   }
-  
+
   .with-tags {
     .d-editor-preview-wrapper {
       margin-top: -77px;