diff --git a/app/controllers/list_controller.rb b/app/controllers/list_controller.rb
index bea88a69e..844bc6ba6 100644
--- a/app/controllers/list_controller.rb
+++ b/app/controllers/list_controller.rb
@@ -84,7 +84,7 @@ class ListController < ApplicationController
     end
 
     define_method("category_#{filter}") do
-      canonical_url "#{Discourse.base_url}#{@category.url}"
+      canonical_url "#{Discourse.base_url_no_prefix}#{@category.url}"
       self.send(filter, category: @category.id)
     end
 
@@ -93,7 +93,7 @@ class ListController < ApplicationController
     end
 
     define_method("parent_category_category_#{filter}") do
-      canonical_url "#{Discourse.base_url}#{@category.url}"
+      canonical_url "#{Discourse.base_url_no_prefix}#{@category.url}"
       self.send(filter, category: @category.id)
     end
 
diff --git a/app/controllers/topics_controller.rb b/app/controllers/topics_controller.rb
index d139479de..d1eacdc89 100644
--- a/app/controllers/topics_controller.rb
+++ b/app/controllers/topics_controller.rb
@@ -83,7 +83,7 @@ class TopicsController < ApplicationController
       response.headers['X-Robots-Tag'] = 'noindex'
     end
 
-    canonical_url UrlHelper.absolute_without_cdn("#{Discourse.base_uri}#{@topic_view.canonical_path}")
+    canonical_url UrlHelper.absolute_without_cdn(@topic_view.canonical_path)
 
     perform_show_response
 
diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index 2dadd8db4..074310835 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -121,7 +121,7 @@ module ApplicationHelper
 
     opts ||= {}
     opts[:image] ||= "#{Discourse.base_url}#{SiteSetting.logo_small_url}"
-    opts[:url] ||= "#{Discourse.base_url}#{request.fullpath}"
+    opts[:url] ||= "#{Discourse.base_url_no_prefix}#{request.fullpath}"
 
     # Use the correct scheme for open graph
     if opts[:image].present? && opts[:image].start_with?("//")