diff --git a/lib/puma/launcher.rb b/lib/puma/launcher.rb
index 8629b7725a..c6b8302a10 100644
--- a/lib/puma/launcher.rb
+++ b/lib/puma/launcher.rb
@@ -267,6 +267,7 @@ def prune_bundler
           spec = Bundler.rubygems.loaded_specs(d_name) rescue nil
           if spec
             deps << "#{d_name}:#{spec.version.to_s}"
+            dirs += spec.require_paths.map { |x| File.join(spec.full_gem_path, x) }
           else
             log "* Couldn't to load extra dependency: #{d_name}"
           end