diff --git a/config/initializers/10-patches.rb b/config/initializers/10-patches.rb
index 0cee95cce..345868410 100644
--- a/config/initializers/10-patches.rb
+++ b/config/initializers/10-patches.rb
@@ -122,13 +122,13 @@ module Propshaft
   Assembly.prepend(Module.new do
     def initialize(config)
       super
-      if Rails.application.config.assets.redmine_detect_update && (!manifest_path.exist? || manifest_outdated?)
+      if Rails.application.config.assets.redmine_detect_update && (!config.manifest_path.exist? || manifest_outdated?)
         processor.process
       end
     end
 
     def manifest_outdated?
-      !!load_path.asset_files.detect{|f| f.mtime > manifest_path.mtime}
+      !!load_path.asset_files.detect{|f| f.mtime > config.manifest_path.mtime}
     end
 
     def load_path