diff --git a/spec/support/hax.rb b/spec/support/hax.rb
index b14e4a5943c..202e8dcc326 100644
--- a/spec/support/hax.rb
+++ b/spec/support/hax.rb
@@ -21,6 +21,8 @@ class Platform
 end
 
 if ENV["BUNDLER_SPEC_VERSION"]
+  require "bundler/version"
+
   module Bundler
     remove_const(:VERSION) if const_defined?(:VERSION)
     VERSION = ENV["BUNDLER_SPEC_VERSION"].dup