diff --git a/config/initializers/100-onebox_options.rb b/config/initializers/100-onebox_options.rb
index e9d0f21c712..d98886e2ba3 100644
--- a/config/initializers/100-onebox_options.rb
+++ b/config/initializers/100-onebox_options.rb
@@ -1,7 +1,16 @@
 # frozen_string_literal: true
 
-Onebox.options = {
-  twitter_client: TwitterApi,
-  redirect_limit: 3,
-  user_agent: "Discourse Forum Onebox v#{Discourse::VERSION::STRING}"
-}
+if Rails.env.development? && SiteSetting.port.to_i > 0
+  Onebox.options = {
+    twitter_client: TwitterApi,
+    redirect_limit: 3,
+    user_agent: "Discourse Forum Onebox v#{Discourse::VERSION::STRING}",
+    allowed_ports: [80, 443, SiteSetting.port.to_i]
+  }
+else
+  Onebox.options = {
+    twitter_client: TwitterApi,
+    redirect_limit: 3,
+    user_agent: "Discourse Forum Onebox v#{Discourse::VERSION::STRING}"
+  }
+end
diff --git a/lib/oneboxer.rb b/lib/oneboxer.rb
index 96245cf820a..fba6704045b 100644
--- a/lib/oneboxer.rb
+++ b/lib/oneboxer.rb
@@ -290,10 +290,6 @@ module Oneboxer
 
       options[:cookie] = fd.cookie if fd.cookie
 
-      if Rails.env.development? && SiteSetting.port.to_i > 0
-        Onebox.options = { allowed_ports: [80, 443, SiteSetting.port.to_i] }
-      end
-
       r = Onebox.preview(uri.to_s, options)
 
       { onebox: r.to_s, preview: r&.placeholder_html.to_s }