5 files changed, 5 insertions, 0 deletions
diff --git a/ext/win32/lib/Win32API.rb b/ext/win32/lib/Win32API.rb
index 71f1d30e01..43db7db67b 100644
--- a/ext/win32/lib/Win32API.rb
+++ b/ext/win32/lib/Win32API.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 # -*- ruby -*-
 # for backward compatibility
 warn "Warning:#{caller[0].sub(/:in `.*'\z/, '')}: Win32API is deprecated after Ruby 1.9.1; use fiddle directly instead" if $VERBOSE
diff --git a/ext/win32/lib/win32/importer.rb b/ext/win32/lib/win32/importer.rb
index 7975cb7f5d..2bef016c29 100644
--- a/ext/win32/lib/win32/importer.rb
+++ b/ext/win32/lib/win32/importer.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 require 'fiddle/import'
 
 module Win32
diff --git a/ext/win32/lib/win32/registry.rb b/ext/win32/lib/win32/registry.rb
index aa2d9fc0ce..1f8f2d0112 100644
--- a/ext/win32/lib/win32/registry.rb
+++ b/ext/win32/lib/win32/registry.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 require 'win32/importer'
 
 module Win32
diff --git a/ext/win32/lib/win32/resolv.rb b/ext/win32/lib/win32/resolv.rb
index b5c11bf878..183d5d38da 100644
--- a/ext/win32/lib/win32/resolv.rb
+++ b/ext/win32/lib/win32/resolv.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 =begin
 = Win32 DNS and DHCP I/F
 
diff --git a/ext/win32/lib/win32/sspi.rb b/ext/win32/lib/win32/sspi.rb
index 4645e1b306..20441b389c 100644
--- a/ext/win32/lib/win32/sspi.rb
+++ b/ext/win32/lib/win32/sspi.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 #
 # = win32/sspi.rb
 #