diff --git a/ext/pathname/lib/pathname.rb b/ext/pathname/lib/pathname.rb
index 85588663f8..68cc01b232 100644
--- a/ext/pathname/lib/pathname.rb
+++ b/ext/pathname/lib/pathname.rb
@@ -1,3 +1,4 @@
+#
 # -*- frozen_string_literal: true -*-
 #
 # = pathname.rb
diff --git a/lib/pp.rb b/lib/pp.rb
index ef787bb764..6db423da23 100644
--- a/lib/pp.rb
+++ b/lib/pp.rb
@@ -1,3 +1,4 @@
+#
 # -*- frozen_string_literal: true -*-
 
 require 'prettyprint'
diff --git a/lib/prettyprint.rb b/lib/prettyprint.rb
index dc63e49321..454c69233d 100644
--- a/lib/prettyprint.rb
+++ b/lib/prettyprint.rb
@@ -1,3 +1,4 @@
+#
 # -*- frozen_string_literal: true -*-
 #
 # This class implements a pretty printing algorithm. It finds line breaks and
diff --git a/lib/resolv.rb b/lib/resolv.rb
index fbfd822799..a5eb9fe55f 100644
--- a/lib/resolv.rb
+++ b/lib/resolv.rb
@@ -1,3 +1,4 @@
+#
 # -*- frozen_string_literal: true -*-
 
 require 'socket'
diff --git a/lib/tmpdir.rb b/lib/tmpdir.rb
index eafde411a0..adbe404146 100644
--- a/lib/tmpdir.rb
+++ b/lib/tmpdir.rb
@@ -1,3 +1,4 @@
+#
 # -*- frozen_string_literal: true -*-
 #
 # tmpdir - retrieve temporary directory path
diff --git a/test/pathname/test_pathname.rb b/test/pathname/test_pathname.rb
index 339ef7f487..94bcc90bf0 100644
--- a/test/pathname/test_pathname.rb
+++ b/test/pathname/test_pathname.rb
@@ -1,3 +1,4 @@
+#
 # -*- frozen_string_literal: true -*-
 
 require 'test/unit'
diff --git a/test/test_pp.rb b/test/test_pp.rb
index 69594c0aef..70390c7559 100644
--- a/test/test_pp.rb
+++ b/test/test_pp.rb
@@ -1,3 +1,4 @@
+#
 # -*- frozen_string_literal: true -*-
 
 require 'pp'
diff --git a/test/test_prettyprint.rb b/test/test_prettyprint.rb
index 0d087b4a78..30b00095d9 100644
--- a/test/test_prettyprint.rb
+++ b/test/test_prettyprint.rb
@@ -1,3 +1,4 @@
+#
 # -*- frozen_string_literal: true -*-
 
 require 'prettyprint'
diff --git a/tool/transcode-tblgen.rb b/tool/transcode-tblgen.rb
index 569f8026d6..3ff60112d8 100644
--- a/tool/transcode-tblgen.rb
+++ b/tool/transcode-tblgen.rb
@@ -1,3 +1,4 @@
+#
 # -*- frozen_string_literal: true -*-
 
 require 'optparse'