diff --git a/lib/jekyll/commands/build.rb b/lib/jekyll/commands/build.rb
index d505e2fb..baa4e88a 100644
--- a/lib/jekyll/commands/build.rb
+++ b/lib/jekyll/commands/build.rb
@@ -33,7 +33,9 @@ module Jekyll
             build(site, options)
           end
 
-          if options.fetch('watch', false)
+          if options.fetch('detach', false)
+            Jekyll.logger.info "Auto-regeneration:", "disabled when running server detached."
+          elsif options.fetch('watch', false)
             watch(site, options)
           else
             Jekyll.logger.info "Auto-regeneration:", "disabled. Use --watch to enable."