diff --git a/ipaddr.gemspec b/ipaddr.gemspec
index 726035d..87e5820 100644
--- a/ipaddr.gemspec
+++ b/ipaddr.gemspec
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # coding: utf-8
 lib = File.expand_path("../lib", __FILE__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
diff --git a/lib/ipaddr.rb b/lib/ipaddr.rb
index ad99782..9290cc0 100644
--- a/lib/ipaddr.rb
+++ b/lib/ipaddr.rb
@@ -1,4 +1,4 @@
-# frozen_string_literal: false
+# frozen_string_literal: true
 #
 # ipaddr.rb - A class to manipulate an IP address
 #
diff --git a/test/test_ipaddr.rb b/test/test_ipaddr.rb
index 1ad4534..6a0e807 100644
--- a/test/test_ipaddr.rb
+++ b/test/test_ipaddr.rb
@@ -1,4 +1,4 @@
-# frozen_string_literal: false
+# frozen_string_literal: true
 require 'test/unit'
 require 'ipaddr'