diff --git a/ext/etc/extconf.rb b/ext/etc/extconf.rb
index 11bc9458c0..1e679b5d0b 100644
--- a/ext/etc/extconf.rb
+++ b/ext/etc/extconf.rb
@@ -1,4 +1,4 @@
-# frozen_string_literal: false
+# frozen_string_literal: true
 require 'mkmf'
 
 headers = []
diff --git a/ext/etc/mkconstants.rb b/ext/etc/mkconstants.rb
index 0c4d17e6f9..18f34c9875 100644
--- a/ext/etc/mkconstants.rb
+++ b/ext/etc/mkconstants.rb
@@ -1,4 +1,4 @@
-# frozen_string_literal: false
+# frozen_string_literal: true
 require 'optparse'
 require 'erb'
 
diff --git a/test/etc/test_etc.rb b/test/etc/test_etc.rb
index ec9083eb16..f93c5a0e11 100644
--- a/test/etc/test_etc.rb
+++ b/test/etc/test_etc.rb
@@ -1,4 +1,4 @@
-# frozen_string_literal: false
+# frozen_string_literal: true
 require "test/unit"
 require "etc"