diff --git a/app/assets/javascripts/discourse/controllers/discovery/topics.js.es6 b/app/assets/javascripts/discourse/controllers/discovery/topics.js.es6
index eb1f7afc2..650eb1c83 100644
--- a/app/assets/javascripts/discourse/controllers/discovery/topics.js.es6
+++ b/app/assets/javascripts/discourse/controllers/discovery/topics.js.es6
@@ -85,7 +85,7 @@ var controllerOpts = {
       if (selected.length > 0) {
         promise = Discourse.Topic.bulkOperation(selected, operation);
       } else {
-        promise = Discourse.Topic.bulkOperationByFilter(this.get('filter'), operation);
+        promise = Discourse.Topic.bulkOperationByFilter('unread', operation, this.get('category.id'));
       }
       promise.then(function(result) {
         if (result && result.topic_ids) {
@@ -105,8 +105,12 @@ var controllerOpts = {
     return Discourse.TopicTrackingState.current();
   }.property(),
 
+  isFilterPage: function(filter, filterType) {
+    return filter.match(new RegExp(filterType + '$', 'gi')) ? true : false;
+  },
+
   showDismissRead: function() {
-    return this.get('filter') === 'unread' && this.get('topics.length') > 0;
+    return this.isFilterPage(this.get('filter'), 'unread') && this.get('topics.length') > 0;
   }.property('filter', 'topics.length'),
 
   showResetNew: function() {
@@ -114,8 +118,8 @@ var controllerOpts = {
   }.property('filter', 'topics.length'),
 
   showDismissAtTop: function() {
-    return (this.get('filter') === 'new' ||
-           this.get('filter') === 'unread') &&
+    return (this.isFilterPage(this.get('filter'), 'new') ||
+           this.isFilterPage(this.get('filter'), 'unread')) &&
            this.get('topics.length') >= 30;
   }.property('filter', 'topics.length'),
 
diff --git a/app/assets/javascripts/discourse/models/topic.js b/app/assets/javascripts/discourse/models/topic.js
index f748e2b33..08f669aa4 100644
--- a/app/assets/javascripts/discourse/models/topic.js
+++ b/app/assets/javascripts/discourse/models/topic.js
@@ -471,10 +471,12 @@ Discourse.Topic.reopenClass({
     });
   },
 
-  bulkOperationByFilter: function(filter, operation) {
+  bulkOperationByFilter: function(filter, operation, categoryId) {
+    var data = { filter: filter, operation: operation };
+    if (categoryId) data['category_id'] = categoryId;
     return Discourse.ajax("/topics/bulk", {
       type: 'PUT',
-      data: { filter: filter, operation: operation }
+      data: data
     });
   },
 
diff --git a/app/controllers/topics_controller.rb b/app/controllers/topics_controller.rb
index a52708635..ade19cbd5 100644
--- a/app/controllers/topics_controller.rb
+++ b/app/controllers/topics_controller.rb
@@ -364,7 +364,9 @@ class TopicsController < ApplicationController
       topic_ids = params[:topic_ids].map {|t| t.to_i}
     elsif params[:filter] == 'unread'
       tq = TopicQuery.new(current_user)
-      topic_ids = TopicQuery.unread_filter(tq.joined_topic_user).listable_topics.pluck(:id)
+      topics = TopicQuery.unread_filter(tq.joined_topic_user).listable_topics
+      topics = topics.where('category_id = ?', params[:category_id]) if params[:category_id]
+      topic_ids = topics.pluck(:id)
     else
       raise ActionController::ParameterMissing.new(:topic_ids)
     end