diff --git a/config/application.rb b/config/application.rb
index cdd676eb759..ce62faa6fef 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -99,7 +99,8 @@ module Discourse
     config.skip_multisite_middleware = true
     config.skip_rails_failover_active_record_middleware = true
 
-    config.multisite_config_path = File.absolute_path(GlobalSetting.multisite_config_path, Rails.root)
+    multisite_config_path = ENV['DISCOURSE_MULTISITE_CONFIG_PATH'] || GlobalSetting.multisite_config_path
+    config.multisite_config_path = File.absolute_path(multisite_config_path, Rails.root)
 
     # Disable so this is only run manually
     # we may want to change this later on