diff --git a/lib/puma/cli.rb b/lib/puma/cli.rb
index ef8ba18a..2d9b8811 100644
--- a/lib/puma/cli.rb
+++ b/lib/puma/cli.rb
@@ -473,8 +473,13 @@ module Puma
 
         if puma_lib_dir
           log "* Pruning Bundler environment"
+
+          home = ENV['GEM_HOME']
+
           Bundler.with_clean_env do
 
+            ENV['GEM_HOME'] = home
+
             wild = File.expand_path(File.join(puma_lib_dir, "../bin/puma-wild"))
 
             wild_loadpath = dirs.join(":")