diff --git a/lib/rubygems/install_update_options.rb b/lib/rubygems/install_update_options.rb
index 0d0f0dc211..57c41b7586 100644
--- a/lib/rubygems/install_update_options.rb
+++ b/lib/rubygems/install_update_options.rb
@@ -158,7 +158,7 @@ module Gem::InstallUpdateOptions
       options[:without_groups].concat v.map(&:intern)
     end
 
-    add_option(:"Install/Update", "--default",
+    add_option(:Deprecated, "--default",
                "Add the gem's full specification to",
                "specifications/default and extract only its bin") do |v,_o|
       options[:install_as_default] = v