diff --git a/app/assets/javascripts/discourse/models/composer.js.es6 b/app/assets/javascripts/discourse/models/composer.js.es6
index a3d8f843642..e782c4074ae 100644
--- a/app/assets/javascripts/discourse/models/composer.js.es6
+++ b/app/assets/javascripts/discourse/models/composer.js.es6
@@ -686,6 +686,10 @@ const Composer = RestModel.extend({
     }).catch(throwAjaxError(function() {
       if (postStream) {
         postStream.undoPost(createdPost);
+
+        if (post) {
+          post.set('reply_count', post.get('reply_count') - 1);
+        }
       }
       Ember.run.next(() => composer.set('composeState', OPEN));
     }));