2 files changed, 24 insertions, 1 deletions
diff --git a/lib/rubygems.rb b/lib/rubygems.rb
index 1225cbe5cb..fc97f5ff25 100644
--- a/lib/rubygems.rb
+++ b/lib/rubygems.rb
@@ -1144,7 +1144,7 @@ An Array (#{env.inspect}) was passed in from #{caller[3]}
 
     ENV["BUNDLE_GEMFILE"] ||= File.expand_path(path)
     require_relative "rubygems/user_interaction"
-    require "bundler"
+    require_relative "rubygems/bundler_integration"
     begin
       Gem::DefaultUserInteraction.use_ui(ui) do
         Bundler.ui.silence do
diff --git a/lib/rubygems/bundler_integration.rb b/lib/rubygems/bundler_integration.rb
new file mode 100644
index 0000000000..28228e2398
--- /dev/null
+++ b/lib/rubygems/bundler_integration.rb
@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+require "bundler/version"
+
+if Bundler::VERSION > "2.6.9"
+  require "bundler"
+else
+  previous_platforms = {}
+
+  platform_const_list = ["JAVA", "MSWIN", "MSWIN64", "MINGW", "X64_MINGW_LEGACY", "X64_MINGW", "UNIVERSAL_MINGW", "WINDOWS", "X64_LINUX", "X64_LINUX_MUSL"]
+
+  platform_const_list.each do |platform|
+    previous_platforms[platform] = Gem::Platform.const_get(platform)
+    Gem::Platform.send(:remove_const, platform)
+  end
+
+  require "bundler"
+
+  platform_const_list.each do |platform|
+    Gem::Platform.send(:remove_const, platform) if Gem::Platform.const_defined?(platform)
+    Gem::Platform.const_set(platform, previous_platforms[platform])
+  end
+end