diff --git a/middleman-core/lib/middleman-core/core_extensions/file_watcher.rb b/middleman-core/lib/middleman-core/core_extensions/file_watcher.rb
index d7dec64a..7bfd2ea2 100644
--- a/middleman-core/lib/middleman-core/core_extensions/file_watcher.rb
+++ b/middleman-core/lib/middleman-core/core_extensions/file_watcher.rb
@@ -148,7 +148,7 @@ module Middleman
         # @return [Boolean]
         def ignored?(path)
           path = path.to_s
-          config[:file_watcher_ignore].any? { |r| path =~ r }
+          app.config[:file_watcher_ignore].any? { |r| path =~ r }
         end
 
         # Notify callbacks for a file given an array of callbacks