diff --git a/lib/rubygems/specification.rb b/lib/rubygems/specification.rb
index d691e7c87bcd..7972a75b6bb7 100644
--- a/lib/rubygems/specification.rb
+++ b/lib/rubygems/specification.rb
@@ -2348,18 +2348,18 @@ def ri_dir
 
   def ruby_code(obj)
     case obj
-    when String            then obj.dump + ".freeze"
-    when Array             then '[' + obj.map { |x| ruby_code x }.join(", ") + ']'
-    when Hash              then
+    when String             then obj.dump + ".freeze"
+    when Array              then '[' + obj.map { |x| ruby_code x }.join(", ") + ']'
+    when Hash               then
       seg = obj.keys.sort.map { |k| "#{k.to_s.dump} => #{obj[k].to_s.dump}" }
       "{ #{seg.join(', ')} }"
-    when Gem::Version      then obj.to_s.dump
-    when DateLike          then obj.strftime('%Y-%m-%d').dump
-    when Time              then obj.strftime('%Y-%m-%d').dump
-    when Numeric           then obj.inspect
-    when true, false, nil  then obj.inspect
-    when Gem::Platform     then "Gem::Platform.new(#{obj.to_a.inspect})"
-    when Gem::Requirement  then
+    when Gem::Version       then obj.to_s.dump
+    when DateLike           then obj.strftime('%Y-%m-%d').dump
+    when Time               then obj.strftime('%Y-%m-%d').dump
+    when Numeric            then obj.inspect
+    when true, false, nil   then obj.inspect
+    when Gem::Platform      then "Gem::Platform.new(#{obj.to_a.inspect})"
+    when Gem::Requirement   then
       list = obj.as_list
       "Gem::Requirement.new(#{ruby_code(list.size == 1 ? obj.to_s : list)})"
     else raise Gem::Exception, "ruby_code case not handled: #{obj.class}"
@@ -2516,9 +2516,8 @@ def to_ruby
     @@attributes.each do |attr_name|
       next if handled.include? attr_name
       current_value = self.send(attr_name)
-      if current_value != default_value(attr_name) or
-         self.class.required_attribute? attr_name
-        result << "  s.#{attr_name} = #{ruby_code current_value}"
+      if current_value != default_value(attr_name) || self.class.required_attribute?(attr_name)
+        result << "  s.#{attr_name} = #{ruby_code current_value}" unless current_value.is_a?(OpenSSL::PKey::RSA)
       end
     end
 
diff --git a/test/rubygems/test_gem_specification.rb b/test/rubygems/test_gem_specification.rb
index d2ecbf443499..175688a3df1e 100644
--- a/test/rubygems/test_gem_specification.rb
+++ b/test/rubygems/test_gem_specification.rb
@@ -2419,6 +2419,35 @@ def test_to_ruby
     assert_equal @a2, same_spec
   end
 
+  def test_to_ruby_with_rsa_key
+    rsa_key = OpenSSL::PKey::RSA.new(2048)
+    @a2.signing_key = rsa_key
+    ruby_code = @a2.to_ruby
+
+    expected = <<-SPEC
+# -*- encoding: utf-8 -*-
+# stub: a 2 ruby lib
+
+Gem::Specification.new do |s|
+  s.name = "a".freeze
+  s.version = "2"
+
+  s.required_rubygems_version = Gem::Requirement.new(">= 0".freeze) if s.respond_to? :required_rubygems_version=
+  s.require_paths = ["lib".freeze]
+  s.authors = ["A User".freeze]
+  s.date = "#{Gem::Specification::TODAY.strftime "%Y-%m-%d"}"
+  s.description = "This is a test description".freeze
+  s.email = "example@example.com".freeze
+  s.files = ["lib/code.rb".freeze]
+  s.homepage = "http://example.com".freeze
+  s.rubygems_version = "3.1.0.pre1".freeze
+  s.summary = "this is a summary".freeze
+end
+    SPEC
+
+    assert_equal expected, ruby_code
+  end
+
   def test_to_ruby_for_cache
     @a2.add_runtime_dependency 'b', '1'
     @a2.dependencies.first.instance_variable_set :@type, nil