diff --git a/spec/bin/rspec b/spec/bin/rspec
index 1f61e3c64c..a41aa4896a 100755
--- a/spec/bin/rspec
+++ b/spec/bin/rspec
@@ -1,6 +1,7 @@
 #!/usr/bin/env ruby
 # frozen_string_literal: true
 
+require_relative "../bundler/support/switch_rubygems"
 require_relative "../bundler/support/rubygems_ext"
 
 Spec::Rubygems.gem_load("rspec-core", "rspec")
diff --git a/spec/bundler/support/switch_rubygems.rb b/spec/bundler/support/switch_rubygems.rb
index a138d22333..640b9f83b7 100644
--- a/spec/bundler/support/switch_rubygems.rb
+++ b/spec/bundler/support/switch_rubygems.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
 
 require_relative "rubygems_version_manager"
+ENV["RGV"] ||= "."
 RubygemsVersionManager.new(ENV["RGV"]).switch