diff --git a/bundler/lib/bundler/rubygems_ext.rb b/bundler/lib/bundler/rubygems_ext.rb
index aa2d39f5e091..876c03eb9ff4 100644
--- a/bundler/lib/bundler/rubygems_ext.rb
+++ b/bundler/lib/bundler/rubygems_ext.rb
@@ -334,11 +334,16 @@ def extensions_dir
   require "rubygems/name_tuple"
 
   class NameTuple
-    def self.new(name, version, platform="ruby")
-      if Gem::Platform === platform
-        super(name, version, platform.to_s)
-      else
-        super
+    # Versions of RubyGems before about 3.5.0 don't to_s the platform.
+    unless Gem::NameTuple.new("a", Gem::Version.new("1"), Gem::Platform.new("x86_64-linux")).platform.is_a?(String)
+      alias_method :initialize_with_platform, :initialize
+
+      def initialize(name, version, platform=Gem::Platform::RUBY)
+        if Gem::Platform === platform
+          initialize_with_platform(name, version, platform.to_s)
+        else
+          initialize_with_platform(name, version, platform)
+        end
       end
     end
 
diff --git a/bundler/spec/other/ext_spec.rb b/bundler/spec/other/ext_spec.rb
index 4d6ee2edf8d3..4d954b474f58 100644
--- a/bundler/spec/other/ext_spec.rb
+++ b/bundler/spec/other/ext_spec.rb
@@ -63,3 +63,23 @@
     run "Gem::SourceIndex.new([]).refresh!", raise_on_error: false
   end
 end
+
+RSpec.describe "Gem::NameTuple" do
+  describe "#initialize" do
+    it "creates a Gem::NameTuple with equality regardless of platform type" do
+      gem_platform = Gem::NameTuple.new "a", v("1"), pl("x86_64-linux")
+      str_platform = Gem::NameTuple.new "a", v("1"), "x86_64-linux"
+      expect(gem_platform).to eq(str_platform)
+      expect(gem_platform.hash).to eq(str_platform.hash)
+      expect(gem_platform.to_a).to eq(str_platform.to_a)
+    end
+  end
+
+  describe "#lock_name" do
+    it "returns the lock name" do
+      expect(Gem::NameTuple.new("a", v("1.0.0"), pl("x86_64-linux")).lock_name).to eq("a (1.0.0-x86_64-linux)")
+      expect(Gem::NameTuple.new("a", v("1.0.0"), "ruby").lock_name).to eq("a (1.0.0)")
+      expect(Gem::NameTuple.new("a", v("1.0.0")).lock_name).to eq("a (1.0.0)")
+    end
+  end
+end