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-rw-r--r--ext/unicorn_http/extconf.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/unicorn_http/extconf.rb b/ext/unicorn_http/extconf.rb
index 11099cd..de896fe 100644
--- a/ext/unicorn_http/extconf.rb
+++ b/ext/unicorn_http/extconf.rb
@@ -1,4 +1,5 @@
 # -*- encoding: binary -*-
+# frozen_string_literal: false
 require 'mkmf'
 
 have_func("rb_hash_clear", "ruby.h") or abort 'Ruby 2.0+ required'