diff --git a/config/environments/production.rb b/config/environments/production.rb
index 68cd831ce..71991aecd 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -41,7 +41,10 @@ Rails.application.configure do
   }
 
   # Select Active Storage service via env var; default to local disk.
-  config.active_storage.service = ENV.fetch("ACTIVE_STORAGE_SERVICE", "local").to_sym
+  # Don't overwrite if it's already been set (e.g. by fizzy-saas)
+  if config.active_storage.service.blank?
+    config.active_storage.service = ENV.fetch("ACTIVE_STORAGE_SERVICE", "local").to_sym
+  end
 
   # Enable serving of images, stylesheets, and JavaScripts from an asset server.
   # config.asset_host = "http://assets.example.com"