1 files changed, 1 insertions, 1 deletions
diff --git a/tool/rbinstall.rb b/tool/rbinstall.rb
index c31902bc30..5e582f7bbf 100755
--- a/tool/rbinstall.rb
+++ b/tool/rbinstall.rb
@@ -721,7 +721,7 @@ install?(:ext, :comm, :gem) do
   directories = Gem.ensure_gem_subdirectories(gem_dir, :mode => $dir_mode)
   prepare "bundle gems", gem_dir, directories
   Dir.glob(srcdir+'/gems/*.gem').each do |gem|
-    Gem.install gem
+    Gem.install gem, install_dir: with_destdir(Gem.dir)
     gemname = Pathname(gem).basename
     puts "#{" "*30}#{gemname}"
   end