diff --git a/lib/puma/launcher.rb b/lib/puma/launcher.rb
index daaead4a..81dea80f 100644
--- a/lib/puma/launcher.rb
+++ b/lib/puma/launcher.rb
@@ -301,6 +301,9 @@ module Puma
       log "* Pruning Bundler environment"
       home = ENV['GEM_HOME']
       Bundler.with_original_env do
+        require 'pp'
+        puts 'ENV after Bundler.with_original_env:'
+        pp ENV
         ENV['GEM_HOME'] = home
         ENV['PUMA_BUNDLER_PRUNED'] = '1'
         args = [Gem.ruby, puma_wild_location, '-I', dirs.join(':'), deps.join(',')] + @original_argv