diff --git a/lib/mocha/parameter_matchers/positional_or_keyword_hash.rb b/lib/mocha/parameter_matchers/positional_or_keyword_hash.rb
index 333e2901..0d861aae 100644
--- a/lib/mocha/parameter_matchers/positional_or_keyword_hash.rb
+++ b/lib/mocha/parameter_matchers/positional_or_keyword_hash.rb
@@ -1,5 +1,6 @@
 require 'mocha/configuration'
 require 'mocha/deprecation'
+require 'mocha/ruby_version'
 require 'mocha/parameter_matchers/base'
 require 'mocha/parameter_matchers/has_entries'
 
diff --git a/test/acceptance/failure_messages_test.rb b/test/acceptance/failure_messages_test.rb
index 38640d17..52f744f1 100644
--- a/test/acceptance/failure_messages_test.rb
+++ b/test/acceptance/failure_messages_test.rb
@@ -1,4 +1,5 @@
 require File.expand_path('../acceptance_test_helper', __FILE__)
+require 'mocha/ruby_version'
 
 class FailureMessagesTest < Mocha::TestCase
   OBJECT_ADDRESS_PATTERN = '0x[0-9A-Fa-f]{1,12}'.freeze
diff --git a/test/acceptance/positional_and_keyword_has_inspect_test.rb b/test/acceptance/positional_and_keyword_has_inspect_test.rb
index 49f86394..171dbaa3 100644
--- a/test/acceptance/positional_and_keyword_has_inspect_test.rb
+++ b/test/acceptance/positional_and_keyword_has_inspect_test.rb
@@ -1,3 +1,6 @@
+require File.expand_path('../acceptance_test_helper', __FILE__)
+require 'mocha/ruby_version'
+
 class PositionalAndKeywordHashInspectTest < Mocha::TestCase
   include AcceptanceTest
 
diff --git a/test/unit/hash_inspect_test.rb b/test/unit/hash_inspect_test.rb
index d74ca68e..3d75a766 100644
--- a/test/unit/hash_inspect_test.rb
+++ b/test/unit/hash_inspect_test.rb
@@ -1,5 +1,6 @@
 require File.expand_path('../../test_helper', __FILE__)
 require 'mocha/inspect'
+require 'mocha/ruby_version'
 
 class HashInspectTest < Mocha::TestCase
   def test_should_return_string_representation_of_hash
diff --git a/test/unit/object_inspect_test.rb b/test/unit/object_inspect_test.rb
index acb32ac6..3335a7c0 100755
--- a/test/unit/object_inspect_test.rb
+++ b/test/unit/object_inspect_test.rb
@@ -1,5 +1,6 @@
 require File.expand_path('../../test_helper', __FILE__)
 require 'mocha/inspect'
+require 'mocha/ruby_version'
 require 'method_definer'
 
 class ObjectInspectTest < Mocha::TestCase