diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index 3a94fe59bdf..fe60409f75b 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -284,9 +284,10 @@ class ApplicationController < ActionController::Base
     end
 
     def custom_html_json
+      target = view_context.mobile_view? ? :mobile : :desktop
       data = {
-        top: SiteCustomization.custom_top(session[:preview_style]),
-        footer: SiteCustomization.custom_footer(session[:preview_style])
+        top: SiteCustomization.custom_top(session[:preview_style], target),
+        footer: SiteCustomization.custom_footer(session[:preview_style], target)
       }
 
       if DiscoursePluginRegistry.custom_html