diff --git a/middleman-core/lib/middleman-core/preview_server.rb b/middleman-core/lib/middleman-core/preview_server.rb
index b70e9c99..4b2b713b 100644
--- a/middleman-core/lib/middleman-core/preview_server.rb
+++ b/middleman-core/lib/middleman-core/preview_server.rb
@@ -160,6 +160,9 @@ module Middleman
                                     path: root,
                                     only: match_against
 
+              # Hack around bower_components in root.
+              watcher.listener.ignore(/^bower_components/)
+              
               # Hack around node_modules in root.
               watcher.listener.ignore(/^node_modules/)